Reverse Dictionary: OBN – OBSER

OBNOXIOUS – adjectives
– BIRDTURD stupid; obnoxious; lousy; worthless …Bk2006 US sl.
– CHOPPED physically unattractive or obnoxious …20C teen & high school sl.
– CRUNK crazy, obnoxious …1990s US college & teen sl.
– DIPSHIT pert. to someone or something obnoxious, stupid, or offensive …Bk2006 US sl.
– EVIL of persons: ill-tempered, cross, disagreeable, unpleasant, contentious, obnoxious, hostile, neurotic, angry, obstinate …OE
– OB obnoxious …1960s sl.
– OBNO obnoxious …1979 Amer. college sl.
– OFF THE WALL adj. odd, eccentric; crazy; obnoxious, offensive, pointless …1937 US sl.
– SCHMOCK an obnoxious person …Brit. sl.
– SHMOCK an obnoxious person …Brit. sl.
– TARRED WITH THE SAME BRUSH stained with the same or similar faults or obnoxious qualities, corrupt …1823
– TARRED WITH THE SAME STICK stained with the same or similar faults or obnoxious qualities, corrupt …1818
– TOUCHED WITH THE SAME TAR-BRUSH stained with the same or similar faults or obnoxious qualities, corrupt …1895
obnoxious – nouns
– PUKE any object or situation that is so inferior, obnoxious, ugly, or disliked that it makes one vomit …Bk1974 Amer. sl.
obnoxious – person 
– ANKLE an extremely obnoxious person …1990s sl.
– ARMPIT an obnoxious, unfriendly person …1968 US sl.
– ASHCAN an obnoxious person …1929 Amer. sl.
– BAG 1. a woman who is unattractive, obnoxious, or otherwise unpleasant …1922 Amer. sl.
2. an obnoxious person, male or female …1944 Amer. students’ usage
– BAM a foolish, annoying, or obnoxious person; a belligerent or disruptive person; often used as a contemptuous form of address …1959 Sc. colloq.
– BAMPOT a foolish, annoying, or obnoxious person; a belligerent or disruptive person; an eccentric person; often used as a contemptuous form of address …1962 Sc. colloq.
– BAMSTICK a foolish, annoying, or obnoxious person; a belligerent or disruptive person; often used as a contemptuous form of address …1965 Sc. colloq.
– BAWBAG an ignorant, obnoxious, or otherwise detestable person, esp. a man; often used as a disparaging form of address …1999 Sc.
– BEAN a term of disparagement for a foolish, unpleasant or obnoxious person …1915 US sl.
– BIG CHEESE a foolish, obnoxious, or inept person; anyone who has pretensions to being smart …1918 US sl.
– BIRD TURD an insignificant, worthless person. an obnoxious person …1959 US sl.
– BOHUNKUS a stupid, obnoxious, or worthless person; often used as a term of abuse or a contemptuous form of address …1933
– BORE an unwelcome visitor, who makes himself obnoxious by his disagreeable manners …1848 Amer. dial.
– BUTTHEAD (derogatory) a stupid or obnoxious person of either sex …Bk2006 US sl.
– BUTTHOLE a foolish or despicable person; an obnoxious person …1962 Amer. sl.
– CHIT an obnoxious person; a worthless person …17C colloq.
– DIRK a foolish, peculiar, or obnoxious person; an absent-minded or inattentive person; a jerk …1964 US sl.
– DIRTBALL a filthy, contemptible, or obnoxious person …1974 US sl.
– DUDE a foolish or obnoxious fellow …1967 US sl.
– EGG a foolish, ineffectual, or obnoxious person …1918 US sl.
– EGG-FOR-FUCK a fool, a simpleton, an obnoxious person …1990s US college sl.
– EGGNOG a foolish or obnoxious person …c1921 US sl.
– EL SLEAZO a disgusting, obnoxious person …1970s US sl.
– FARTHOLE a contemptible person ; an obnoxious or foolish person …1970 Amer. sl.
– GRUB an offensive, obnoxious, or unattractive person …1966 Amer. sl.
– FUNKY-BUTT an obnoxious person …1964 US jazz usage
– GAUNCH a gross or obnoxious person …1954 US college sl.
– GEEP an obnoxious, inept, or suspicious-looking person; an offensive or unpleasant person …1940 US sl.
– GEEPO an obnoxious, inept, or suspicious-looking person …1950 US sl.
– GERBIL a stupid, insignificant, or unpleasant person; a foolish or obnoxious person …1986 US sl.
– GIMP (derogatory) a stupid, foolish, unpleasant, obnoxious, or contemptible person; a simpleton; an incompetent or weak person …1924 sl., orig. US
– GIMPY (derogatory) a stupid, foolish, unpleasant, obnoxious, or contemptible person …1959 US sl.
– GLEEF an odd, obnoxious, or worthless person …1963 US sl.
– GLEEP an odd, obnoxious, or foolish person; a stupid person; an oaf; a disliked person …1947 US college sl.
– GRUB an offensive, obnoxious, or unattractive person …1966 Amer. sl. 
– GRUNGE a slovenly or offensive person; an obnoxious person; someone who is sloppy in dress  …1965 Amer. student sl.
– GWEEB a person who entirely lacks style; a tedious and contemptible person; an obnoxious person; an over-diligent student …1984 Amer. campus sl.
– GWEEBO a person who entirely lacks style; a tedious and contemptible person; an obnoxious person; an over-diligent student …1986 Amer. campus sl.
– HAIRBALL an obnoxious, boorish person, esp. when drunk …1981 US sl.
– HATEFUL an obnoxious or vexatious person or animal …1913 Amer. dial.
– MAROON an obnoxious or foolish person; a stupid person  …1941 Amer. sl.
– MELVIN a person who is old-fashioned or unappealing; a dull, uninformed, or obnoxious person; a profoundly objectionable person …1954 Amer. sl.
– MIDLAND BANKER an obnoxious person …Bk2004 Brit. rhyming sl. for ‘wanker’
– MOA-FUGG a ‘motherfucker’; an obnoxious, despicable, contemptible, or unpleasant person …1962 US sl.
– MO DICKER a ‘motherfucker; an obnoxious, despicable, contemptible, or unpleasant person; a lazy, irresponsible person …1968-70 Amer. sl.
– MOFO a ‘motherfucker’; an obnoxious, despicable, contemptible, or unpleasant person …1965 Amer. sl.
– MOFUCK a ‘motherfucker’; an obnoxious, despicable, contemptible, or unpleasant person …1962 Amer. sl.
– MO-FUCKER a ‘motherfucker’; an obnoxious, despicable, contemptible, or unpleasant person …1987 Amer. sl.
– MOLLY-DODGER a ‘motherfucker’; an obnoxious, contemptible, despicable, or unpleasant person …1964 US Black sl.
– MOLLYWOPPER a ‘motherfucker’; an obnoxious, contemptible, despicable, or unpleasant person …1973 US sl.
– MOMMA a ‘motherfucker’; an obnoxious, despicable, contemptible, or unpleasant person …1975 US sl.
– MOMMA-HOPPER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1975 US euphemism
– MOTHAFUCKA a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1918 sl., orig. US Black
– MOTHBALL * an insignificant or foolish person; an obnoxious or aggravating person; a teenage jerk; an irritating person; an over-diligent student …1944 US sl.
– MOTHER a ‘motherfucker’; an obnoxious, despicable, contemptible, or unpleasant person …1955 sl., orig. & chiefly US
– MOTHER-BUGGER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1970 US euphemism
– MOTHER CRUSHER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1959 US euphemism
– MOTHEREE * a ‘motherfucker’; an obnoxious, despicable, contemptible, or unpleasant person …1938 US sl.
– MOTHEREFF a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1961 US euphemism
– MOTHEREN a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1948 US euphemism
– MOTHERFATHER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1992 US sl.
– MOTHERFERYER a ‘motherfucker’; an obnoxious, despicable, contemptible, or unpleasant person …1946 US euphemism
– MOTHER-FLICKER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1998 US euphemism
– MOTHER-FLUNKER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …2002 US euphemism
– MOTHER-FOR-YOU a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1918 sl., orig. US Black
– MOTHER-FOULER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1949 US euphemism
– MOTHER-FRIGGER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1939 US euphemism
– MOTHERFUCK an obnoxious, despicable, or contemptible person; a very unpleasant person; often a term of abuse …1964 US sl.
– MOTHERFUCKA a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1918 sl., orig. US Black
– MOTHERFUCKER an obnoxious, despicable, or contemptible person; a very unpleasant person; often a term of abuse …1918 sl., orig. & chiefly US
– MOTHERFUG a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1918 sl., orig. US Black
– MOTHERFUGGER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1918 sl., orig. US Black
– MOTHER-FUYER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1935 US euphemism
– MOTHER-GRABBER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1963 US euphemism
– MOTHERHEAD a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1970 US euphemism
– MOTHER-HOPPER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1975 US euphemism
– MOTHER-HUBBA a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1959 US euphemism
– MOTHER-HUBBER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1959 US euphemism
– MOTHER HUBBARD a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1994 US euphemism
– MOTHER-HUGGER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1956 US euphemism
– MOTHER-HUMP a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1976 US euphemism
– MOTHER-HUMPER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1963 US euphemism
– MOTHER-HUNCHER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1962 euphemism
– MOTHER-JIVER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1959 US euphemism
– MOTHER-JUMP a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1975 US euphemism
– MOTHER-JUMPER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1949 US euphemism
– MOTHER-LOVER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1951 US euphemism
– MOTHEROO a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1999 euphemism
– MOTHER-PLUGGER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1959 US euphemism
– MOTHER-RAPER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1959 US euphemism
– MOTHER-RUBBER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1973 US euphemism
– MOTHERSCRATCHER a ‘motherfucker’; an obnoxious, despicable, contemptible or very unpleasant person …2001 US sl.
– MOTHERSELLER a ‘motherfucker’; an obnoxious, despicable, contemptible or very unpleasant person …1953 US sl.
– MOTHER-SUCKER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1952 US euphemism
– MOTOR SCOOTER a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1960 US euphemism
– MOTORCYCLE a ‘motherfucker’; an obnoxious, despicable, contemptible, or very unpleasant person …1938 US sl.
– NARD an obnoxious person …1960s US sl.
– OBNO an obnoxious, loud, crude person …1979 Amer. college sl.
– OBNOC a crude, obnoxious person …1970s US campus sl.
– OBNOXO a crude, obnoxious person …1970s US campus sl.
– OLD BAG (disparaging) an unattractive, obnoxious, or unpleasant old woman; an old hag, any old woman …1922 sl., orig. US
– ONBEAST † an obnoxious person …1808 Sc.
– PAIN IN THE ARSE, PAIN IN THE ASS an annoying or obnoxious person …1934 sl.
– PAIN IN THE ASSHOLE an annoying or obnoxious person …1998 sl.
– PAIN IN THE BALLS an annoying or obnoxious person …1973 US sl.
– PAIN IN THE BLEEP an annoying or obnoxious person …1972 sl.
– PAIN IN THE BUM an annoying or obnoxious person …1982 sl.
– PAIN IN THE CLINKERS an annoying or obnoxious person …1993 Irish sl.
– PAIN IN THE DERRIERE an obnoxious person …20C US colloq.
– PAIN IN THE FANNY an annoying or obnoxious person …1934 sl.
– PAIN IN THE HOLE an annoying or obnoxious person …1991 sl.
– PAIN IN THE NECK an annoying, obnoxious person …1941 sl.
– PAIN IN THE REAR a very annoying person or obnoxious person …Bk1981 Amer. sl.
– PAIN IN THE WHOOSIS an annoying or obnoxious person …1934 sl.
– PILL an unpleasant or despicable person; an obnoxious person; an annoying or boring person …1871 sl.
– POT an obnoxious person; a disliked, self-righteous, self-important person of either sex, but esp. a woman of middle age or over …1937 Amer. sl. 
– PUKE an obnoxious person; a real pest …E19 Brit. & US sl.
– SHIT an unpleasant or despicable person; a contemptible, obnoxious, or worthless person …1508
– SHITE an unpleasant or despicable person; a contemptible, obnoxious, or worthless person …1508
– SHITEPOKE a contemptible, obnoxious,  or worthless person …E20 sl.
– SHIT-FACE an unpleasant or despicable person, an obnoxious person, usually male; a term of abusive address …1937 sl.
– SHITHEAD an unpleasant or despicable person, usually male; a term of abuse for an obnoxious person …1961 sl.
– SLEAZO a disgusting, obnoxious person …1970s US sl.
– SLEAZOID a disgusting, obnoxious person …1970s US sl.
– SNOT a term of contempt for a person; an obnoxious or despicable person, esp. a self-important nonentity …E17 sl.
– SPUNK STAIN an obnoxious person …Bk2004 UK sl.
– SUCK an obnoxious person …Bk1999 Aust. sl.
– VARMENT a mischievous or obnoxious lad …1773
– WANK STAIN a tedious, obnoxious person …Bk2004 UK sl.
– WISEASS an obnoxious person with delusions of cleverness …1971 US sl.
– WISEPUSS an obnoxious person with delusions of cleverness …1971 US sl. ​
– YEGG an obnoxious male …Bk1995 Amer. sl.
– YOYO an unpredictable or inconsistent person whose moods and actions go up and down; hence, a fool; an idiot, a dolt; a stupid person; an obnoxious person; an incompetent, or undesirable person; a jerk …1959 US sl.
 
OBOE – nouns
– HAUTBOY an oboe …1575
– HAWBOY a hautboy; an oboe …1889 Eng. dial.
– HOBOY an oboe …1575
– WAITS † wind instruments, either hautboys (oboes), flutes, or shawms (forerunner of the oboe) …1530
oboe – person 
– HAUTBOY an oboe player …1633
– HAUTBOYIST a player on the oboe …1864
– HOBOY an oboe player …1633
 
OBSCENE – adjectives
– BARNYARD smutty, obscene …20C US sl.
– BAWDISH †* obscene, filthy …1572
– BAWDY pert. to or fitting a bawd; lewd, obscene, unchaste; chiefly applied to language …1513
– BESTIAL like a beast in obeying and gratifying the animal instincts and sensual desires; debased, depraved, lustful, obscene …1447
– BLACKGUARD characterized by abusive or obscene language …1806 Amer. dial.
– BLUE coarse, obscene, esp. of a joke, story, film, etc.; having sexual content, pornographic …1818 colloq.
– FEELTHY obscene …M20 sl.
– FULL-FLAVOURED really rotten; obscene …sl.
– HIGH-SEASONED of literature: somewhat lewd, obscene …B1900
– ITHYPHALLIAN † grossly indecent, obscene …1693
– ITHYPHALLIC grossly indecent, obscene …1856
– NAUGHTY pornographic; erotic; obscene; loose …1882 euphemism
– OBSCENOUS † obscene …1604
– OFF-COLOUR tending to be indecent, obscene, lewd, or lascivious, but hinting at or suggesting the obscene …1875 sl.
– OLD-FASHIONED obscene …1930s sl.
– MEATY obscene; with significant sexual content …20C
– PORNY lewd; smutty or obscene; pornographic …1961 Brit. & US sl.
– RAUNCHY racy, obscene, or off-colour …1967 US sl.
– REASTY bad-tempered; also, gross, obscene …1825 Eng. dial.
– ROTTEN of language: morally offensive; obscene …1589
– SALTY unpleasant, uncouth, crude; of language: obscene …1920s US teen sl.
– SCABROUS indecent or scandalous; risqué; obscene 
– SMUTTY obscene, bawdy …17C
– SPURCIDICAL † speaking dishonestly, obscenely, or smuttily; bawdy in speech …1656
– SPURCITIOUS †* filthy, foul, obscene …1628
– ULTRAMARINE obscene, smutty …L19 sl.      
– UNPARLIAMENTARY obscene …M19 sl.
– WORD-WANTON obscene in speech …B1900
obscene – nouns  (includes OBSCENITY)
– BALDERDASH filthy or obscene talk or writing; impudent language; abuse …1715 Eng. dial.
– BAWDINESS lewdness, obscenity …1731
– BAWDRY lewdness in speech or writing; lewd, obscene, or filthy talk, etc. …1589 arch.
– BAWDY lewd, obscene language, lewdness, obscenity …1698
– BELCH worthless or obscene conversation …Bk1898 Eng. dial.
– BESTIALITY filthy language, obscenity …1879
– BROAD STATEMENT speech that includes obscenity and cussing …1969 Amer. dial.
– BROAD TALKING speech that includes obscenity and cussing …1969 Amer. dial.
– DAMSON-PIE abuse; a slanging match; obscene language …c1865 colloq.
– DIRT filth, obscenity, scurrilous information or gossip …1926 sl.
– FRENCH POSTCARDS obscene pictures …M19 colloq.
– FRENCH PRINTS obscene pictures …M19 colloq.
– GUTTER LANGUAGE profanity and obscenity; scabrous speech …1890 Amer. sl.
– HARLOTRY † buffoonery, jesting; ribaldry, scurrility, scurrilous talk; obscene talk or behaviour …c1325
– MILLER an obscene story …Bk1905 Eng. dial.
– NAST obscenity …1790 Eng. dial.
– ONE-FINGER SALUTE an obscene gesture; the ‘finger’ …M20 US sl.
– RAUNCH obscenity, pornography …1960s sl., orig. US
– SHIT DETAIL any unpleasant or dirty talk …1940s sl., orig. military
– SMUT 1. an obscene story; pornography in general …17C
2. obscene language …17C
– SMUTS obscene pictures …E20 US criminals’ sl.
– UNPARLIAMENTARY LANGUAGE language unfit for polite discussion; violent or obscene language …Bk1958 sl.
obscene – person
– BARRACKER one using low language to aid his party …Bk1895 Aust. criminals’ sl.
– DIRTY-MOUTH a person who talks dirty, uses obscene language …Bk2006 US sl.
– GARBAGE MOUTH a person who regularly uses obscene language; a foul-mouthed person …1970 US sl.
– HAWCH-A-MOUTH a foul-mouthed, blustering person; one who talks incessantly in a coarse, vulgar manner using obscene and offensive language …1746 Eng. dial.
– HAWCH-MOUTH a foul-mouthed, blustering person; one who talks incessantly in a coarse, vulgar manner using obscene and offensive language …1746 Eng. dial.
– LATRINE LIPS someone (usually a citizens band radio operator) who habitually uses obscene language …M20 US sl.
– LEWDSBY † a lewd or obscene person …1594
– LEWDSTER * a lewd or obscene person …1598
– POTTY MOUTH someone who uses obscene or profane language in most social settings; a foul-mouthed person …1969 colloq., orig. US
– SALTY DOG one who uses an excess of obscene language …1983 US Black sl.
– SMUTHOUND 1. a man who revels in obscenity and pornography …M20 US sl.
2. a censor; someone who is hunting for smut …M20 US sl.
obscene – verbs  (includes OBSCENITY)
– BADMOUTH to utter obscenities …1972 US sl.
– BLACKGUARD to talk obscenely; to curse or swear at …1902 Amer. dial.
– BLAGGARD to talk obscenely; to curse or swear at …1902 Amer. dial.
– KEEP THE PARTY CLEAN to avoid obscenity or ‘dirty’ stories …1930s sl. ​
– MAKE THE AIR BLUE to swear profusely; to use obscene language …1887
– SMUT to make something obscene …17C
– TALK BAWDY to talk lewdly or obscenely …1656
– TURN THE AIR BLUE to swear profusely; to use obscene language …1867
– WORK BLUE to use obscene language; to peddle smut …1990s Amer. sl.
obscene – phrases
– DO YOU EAT WITH THAT MOUTH? said to someone who talks dirty or obscenely all the time …Bk2006 US sl.
– READ MY LIPS used to convey that one is thinking something insulting or obscene but choosing not to speak it …1980s sl.
 
OBSCURATION – nouns
– ADUMBRATION overshadowing; shade, obscuration …1653
– OBFUSCATION a darkening, obscuration …1608
– OBFUSCITY * a darkening, obscuration …1832
– OBNUBILATION the act of darkening or fact of being darkened as with a cloud; obscuration …1610
– OFFUSCATION * a darkening, obscuration …1502
 
OBSCURE – adjectives
– BECLOUDED made obscure or gloomy …1581
– CALIGINOUS misty, dim, murky; obscure, dark …1548 now arch.
– CREPUSCULOUS of the nature of twilight; in a state between light and darkness; dim, glimmering, dusky, indistinct, obscure …1646
– DARK hard to understand; obscure in meaning …c1320
– DARKLING lying in darkness; showing itself darkly; darksome, obscure …1739
– DARKSOME dark, obscure; ill-lighted …1781 Sc. & Eng. dial.
– DERN secret, obscure …1814 Sc. & Eng. dial.
– FOGGY obscure or confused
– IMPERSPICUOUS * not perspicuous or clear; obscure …1721
– INVOLUTE hidden, obscure …M17
– LATESCENT becoming hidden or obscure …1836
– MIRK dark, gloomy, obscure, dusky …1671 Sc. & Eng. dial. 
– OBLITE †* dim, as if partly blotted out; indistinct, obscure …1650
– OBSCURATIVE †* tending or serving to obscure or render dark …1664
– OBSCUROUS †* dark, gloomy, obscure …1491
– OBUMBILATE †* obscure …c1560
– OPACOUS † lying in shadow; not illuminated, darkened, obscure …1621-3
– OPAQUE † lying in shadow; not illuminated, darkened, obscure …c1420
– ORACULOUS † abstruse, profound, obscure …1625 rare or obs.
– TENEBRICOSE * full of darkness; very dark, obscure; gloomy …1730-6
– TENEBROUS obscure, gloomy …1599
– THESTER † dark, obscure …a900
– UMBRAGEOUS † obscure; dubious …1635
– UMBRAGIOUS † obscure; dubious …1635
– UNKENSPAK inconspicuous, obscure …Bk1905 Eng. dial.
obscure – nouns
– EFFUSCATION †* the act of making obscure; a beclouding …1624
– NEBULA * a misty or obscure affair …a1734
obscure – person 
– FARTKNOCKER any obscure person; a person whose name you don’t know or remember …1984 Amer. dial.
obscure – verbs 
– ADUMBER †* to overshadow, to obscure …1535
– ADUMBRATE to overshadow; to shade, to obscure …1670
– ADUMBRE †* to overshadow, to obscure …1535
– BECLOUD to make obscure; to darken, to hide …1619
– BEFOG to obscure, to confuse …1603
– DARK 1. to obscure, to cloud, to dim, to sully …c1374 arch.
2. † ​to cloud, to dim, to obscure, to hide something luminous …c1380
– DARKLE to render dark or obscure …1884
– OBFUSCATE * to darken, to obscure (physically); to deprive of light or brightness; to make dark or dusky …1650
– OBFUSK † to darken, to obscure (physically); to deprive of light or brightness; to make dark or dusky …1490
– OBNEBULATE * to obscure as with a mist; to befog, to cloud …c1540
– OBNUBILATE to darken, dim, cover, or hide with or as with a cloud; to overcloud; to obscure …1583
– OBSCURIFY †* to make obscure; to hide …1622
– OBUMBER † to overshadow; to shade, to obscure …c1420
– OBUMBILATE †* to obscure …a1711
– OBUMBRATE * to overshadow; to shade, to darken; to obscure …1526
– OFFUSCATE * to darken, to obscure (physically); to deprive of light or brightness; to make dark or dusky …1656
– OFFUSQUE †* to darken, to obscure …a1751
– SEND TO THE PACK to relegate to obscurity …1916 Aust. sl. ​
 
OBSCURED – adjectives
– ADNUBILATED * darkened by clouds; clouded; obscured …1730 
– DELITESCENT lying hid, concealed, or obscured …1684
– OBFUSCATE † darkened, obscured …1531 rare or obs.
– OBNUBILATE † covered or darkened as with a cloud; overclouded; obscured …1560
– OBSCURATE † obscured; darkened …1471
– OFFUSCATE * darkened, obscured …1603
 
OBSCURELY – adverbs
– UNDERGROUND in secrecy or concealment; in a hidden or obscure manner …1632
 
OBSCURITY – nouns
– ABSTRUSITY obscurity; anything abstruse; an obscure or recondite matter or point …1646 arch.
– DARKSOMENESS darkness, obscurity …1571
– INPERSPICUITY the reverse of perspicuity or clearness; obscurity …1659
 
OBSEQUIOUS – adjectives
– ASS-KISSING obsequious, sycophantic …1952 Amer. sl.
– ASS-LICKING obsequious, sycophantic; hence, despicable, goddamned …1939 Amer. sl.
– BUTTOCK-LICKING obsequious, sycophantic; hence, despicable, goddamned …1921 Amer. sl.
– COMPLACENTIOUS † complaisant, obsequious, soothing, and thereby, pleasing …1656
– MEACHING skulking, cringing; self-deprecating, obsequious; contemptible, useless, good-for-nothing …1792 Amer. dial.  
– MEECHING skulking, sneaking, creeping softly; cringing; self-deprecating, obsequious; contemptible, useless, good-for-nothing …1792 Eng. & Amer. dial.
– MICHING skulking, cringing; self-deprecating, obsequious; contemptible, useless, good-for-nothing …1792 Amer. dial.
– UP EACH OTHER behaving obsequiously, or in a sycophantic manner towards each other …1940s Aust. sl.
obsequious – nouns  (includes obsequiousness) 
– ARSE-LICKING obsequious behaviour; toadying …1912 sl.
– ASS-KISSING obsequious behaviour; toadying …1942 sl., chiefly US
– BUM-SUCKING obsequious behaviour; toadying …1949 Brit. sl.
– KOWTOW an act of obsequious respect …1834
– OBSEQUENCE * compliance, complaisance, obsequiousness …1603
– OBSEQUIOSITY obsequiousness …1885
– OBSEQUITY * obsequiousness …1892
– OBSEQUY * ready compliance with the will or pleasure of another, esp. of a superior; deferential service; obsequiousness …1432-50
– PULLING WOOL acting in an obsequious manner …1869 Amer. dial.
– UNCLE TOMMING (derogatory) behaving obsequiously toward White people …1944 Amer. dial.
obsequious – person
– APPLE-POLISHER an obsequious person; a toady; a sycophant; a flatterer …Bk1892 colloq., orig. & chiefly US
– ARSE-LICKER an obsequious person; a toady; a sycophant …1938 sl.
– ASS-LICKER an obsequious person; a flatterer; a sycophant, a toady …1939  US sl.
– ASS-KISSER an obsequious person; a toady, a sycophant …1766 sl., chiefly US
– ASS WIPE a worthless, contemptible person, esp. if also obsequious; one who curries favour; a toady …1952 Amer. sl.
– BACK PATTER an obsequious person; a sycophant; a toady  …Bk1942 Amer. sl.
– BACK-SCRATCHER one who praises you for your praise of him or her; an obsequious person; a flatterer, a sycophant, a toady …1897
– BACK SLAPPER an obsequious person; a sycophant; a flatterer; a toady …Bk1942 Amer. sl.
– BOOTKISSER a flattering, fawning, obsequious person; a toady …1966 Amer. dial.
– BOOTLICK a flattering, fawning, obsequious person; a toady, a sycophant; one who tries to curry favour …1849 Amer. dial.
– BROWN-NOSE an obsequious person; a toady; a sycophant …1938 sl., orig. US military usage
– BROWN-NOSER an obsequious person; a toady; a sycophant …1950 sl., orig. US military usage
– BUM-SUCKER an obsequious person; a toady; a sycophant …1877 Brit. sl.
– COCKSUCKER (derogatory) an obsequious and flattering male; a male sycophant …Bk2006 US sl.
– CRAWLER an obsequious person; a toady; a sycophant …1892 sl., orig. Aust.
– ECHO one who assents obsequiously to the opinions of another; a person who reflects or imitates the language, sentiments, or conduct of others …a1631
– GREASER an obsequious person; a toady; a sycophant …1900 sl.
– KOWTOWER an obsequious person; a toady …1961
– LACKEY, LACQUEY one who is servilely obsequious; a toady; a yes-man …c1692
– LIMBERHAM † one who has ‘limber hams’, a supple-jointed person; fig. a servile flatterer; an obsequious person …1689
– OBSERVICER †* one who shows respect, deference or dutiful attention; an obsequious follower …1625
– SUCK an obsequious person; a toady; a sycophant; a schoolchild who curries favour with teachers …1900 sl.
– TANTONY a servile flatterer; a parasite; one who obsequiously follows another …1659
– TANTONY PIG a servile flatterer; a parasite; one who obsequiously follows another …1738
– WAGTAIL † a familiar or contemptuous epithet or form of address applied to a man or young woman; an obsequious person …1605
– YES-GIRL an obsequiously subordinate woman …1930
– YES-MAN a man who agrees from self-interest or fear with everything put to him by a superior; an obsequious subordinate; one who always says yes to their superiors in the belief that this is what they like to hear; a sycophant; a toady; a flatterer …1912 colloq., orig. US
– YES-WIFE an obsequiously subordinate woman …1912
– YES-WOMAN an obsequiously subordinate woman …1933
obsequious – verbs
– AK to curry favour by obsequious behaviour (Ass-Kiss) …1939 US sl.
– ARSE-LICK to behave obsequiously towards; to toady …1968 sl.
– ASSHOLE to grovel, to submit or behave obsequiously …1940 Amer. sl.
– ASS-KISS to curry favour with in a self-degrading manner; to toady; to behave obsequiously to …1961 Amer. sl.
– ASS-LICK to curry-favour; to be obsequious …1937 sl., orig. US
– BUM-SUCK to behave obsequiously towards; to toady …1930 Brit. sl.
– CRAWL to behave obsequiously towards; to toady …1881 sl., orig. Aust.
– JEFF to behave obsequiously, esp. towards Whites; to humiliate oneself …1960s US Black sl.
– KISS SOMEONE’S ARSE to behave obsequiously or sycophantically towards …1749 sl.
– KISS SOMEONE’S ASS to be obsequious or sycophantic towards someone; to curry favour with someone …1749 sl.
– KOWTOW to act in an obsequious or obedient manner …1826
– LICK SOMEONE’S ARSE to behave obsequiously towards …1864 sl.
– LICK SOMEONE’S ASS to curry favour with someone, esp. in a blatant or degrading manner; to behave obsequiously towards …1864 Amer. sl.
– PISS IN SOMEONE’S POCKET to behave obsequiously towards …1967 Aust. sl.
– SUCK AROUND to behave obsequiously …1931 sl., orig. & chiefly US
– SUCK-HOLE to behave obsequiously towards …1961 sl., orig. & chiefly Can.
– SUCK UP (TO) to behave obsequiously towards …1860  sl.
 
OBSERVABLE – adjectives
– PALPABLE readily perceived by some one of the other senses, as the sight, hearing, etc.; perceptible; plainly observable, noticeable …c1430
 
OBSERVANCE – adverbs
– OBSERVANTIALLY †* with careful observance … rare
 
OBSERVANT – adjectives
– ABER sharp-sighted; keenly observant; watchful …1908 Sc.
– ADVISIVE †* observant, prudent …1436
– EYEFUL † observant, vigilant; later, careful …1594 obs. exc. Eng. dial.
– MARKING † observing, observant …1577-87
– OBSERVATIVE * pert. to observation; observant, attentive, heedful …1611
– OCCULATE † possessed of eyes or sight; sharp-sighted; observant …1615
– OCULATE † possessed of eyes or sight; observant, sharp-sighted …1549
– PERCEIVANT †* perceiving, observant, observing, understanding …c1400
observant – person 
– BIG EYE an especially observant, cautious person …Bk1992 sl. 
– OCULIST †* one who has good eyes, or uses them well; a sharp-sighted or observant person …1660
observant – verbs 
– BE ALL EYES to watch attentively; to be keenly observant; to be alert and vigilant …a1616
– KEEP NIT to keep watch, be observant …1903 Aust. sl.
– KEEP YOUR EYES PEELED to be extra-observant …1833 US sl.
– KEEP YOUR EYES SKINNED to be extra-observant …1810s US sl.
– KEEP YOW to keep watch, be observant …1942 Aust. sl.
 
OBSERVATION – adjectives
– OBSERVATICAL †* pert. to (scientific) observation; observational …1703
– OBSERVATIVE * pert. to observation; observant, attentive, heedful …1611
– OBSERVATIVE †* worthy of observation; observable …1608
observation – nouns 
– ADVERTATION †* the act of turning the attention; observation, notice …c1480
– ADVERTENCE the act of turning the attention to; observation, notice, heed, attention, consideration …c1370
– ADVERTISEMENT † the turning of the mind to anything; attention, observation, heed …1523
– ADVISEMENT † the process of looking at or viewing; observation, notice, attention, consideration …1330
– CASES observation; scrutiny …Bk1914 criminals’ sl. 
– GAZEMENT * stare, look, observation …1596
– OBBO observation work …c1919 policemen’s sl.
– OBBS surveillance; observation; a lookout …1933 UK sl.
– OBO surveillance; observation; a lookout …1933 UK sl.
– OBS surveillance; observation; a lookout …1933 UK sl.
– OBSERVAL † the act of observing; observation; observance …a1734
– OBSERVE an observation, scientific or otherwise, a remark, a comment …1700 Sc.
– TENT a look; observation, notice, attention …1824 Sc. & Eng. dial.  
– WAITING † watching, observation …1377
observation – person
– OBSERVATOR 1. † one who marks, notes, or makes observations; formerly a frequent name for a newspaper or pamphlet, and often applied to the editor or writer …1642
2. † ​one who makes a verbal observation …1660
– OBSERVIST one who makes observation his business …1827 nonce word
observation – phrases
– QUICK THINKING, BATMAN used for a humorous, if sarcastic, response to another’s observation or conclusion …1968 US sl.
 
OBSERVE – verbs
– ADNOTE †* to note, to remark, to observe …1558
– ADVERT † to turn the attention to; to take note of; to observe, to note, to heed; to consider, to think of a thing …1430
– ADVERTISE † to notice, to observe a thing …c1430
– ADVISE † to look at, to view, to observe, to consider, to watch; also, to watch for …1297
– CASE to watch; to observe; to scrutinize …Bk1914 criminals’ sl. 
– CLOCK to look at, watch, observe, notice …M20 sl.
– COGNIZE to take note of, to notice, to observe; to know or perceive, to recognize …1821
– EAGLE-EYE to observe and evaluate closely; to scrutinize …1964 Amer. sl.
– GET ON TO to look at; to notice; to observe appreciatively or critically …1882 US sl.
– KEEP † to take in with the eyes, ears, or mind; to take note of, to behold, to observe …c1000
– MARK to observe, to watch, to see, to spy …1377 now poetic
– MIND to observe, to notice; to pay attention or heed to …1838 Sc. & Eng. dial.
– OBSERVATE †* to observe …1652
– OFSEE † to see, to perceive by sight; to catch sight of, to observe …c1000
– PENNY to observe, to scrutinize …1990s W. Indies sl.
– QUOTE † to make mental note of; to notice, to observe, to mark, to scrutinize …1588
– RADDLE to mark, observe, watch …Bk19C Eng. dial.
– SIGHT to observe, to see …1930s UK criminals’ & Black sl.
– SKANK to observe members of the opposite sex …1980s US campus sl.
– SMOKE OVER to look over, to observe critically …1928 Amer. dial.
– TAKE TENT OF to pay attention to; to notice, to observe …1824 Sc. & Eng. dial.
– TENT to see, to observe, to notice …1784 Sc.
– VADA to see; to look; to observe …1859 UK sl.
– VARDA to see; to look; to observe …1859 UK sl.
– VARDI to see; to look; to observe …1859 UK sl.
– VARDO to see; to look; to observe …1859 UK sl.
– VARDY to see; to look; to observe …1859 UK sl.
– VAREEZ to notice, to observe …a1838 Sc.
– WAIT 1. † to watch, to keep one’s eye upon, to observe constantly; to look out for, to watch for …a1300
2. † ​to observe carefully …1399
 
OBSERVED – nouns
– NOTANDUM an entry of something to be specially noted; a thing to be noticed or observed; a memorandum …1685
– OBSERVANDUM * something to be observed or noted …1704
 
OBSERVER – person
– BIRD DOG a watcher, an observer …1952 US sl.
– EAGLE-EYE an observer or lookout …1945 Amer. jocular
– EYER * a person who looks or sees someone or something; an observer; chiefly literary and poetic usage …1611
– FLY ON THE WALL an unperceived observer; one who is able to overhear discussions, etc., without being observed or involved …1949
– KEEKER one who watches or pries; a surreptitious observer of others; a peeping Tom …1892 Sc.
– MARKER † one who notes or observes …c1550
– OBSERVATRIX †* a female observer …1653
– SHOWER † a person who looks out or observes; an observer; a scout; a watchman; also, a person who makes an inspection or examination of something …a1225
– WAITER † one who watches or observes closely; one who is on the lookout …1382
 
OBSERVING – adjectives
– MARKING † observing, observant …1577-87
– NARROW-EYED †* observing closely …1599
– PERCEIVANT †* perceiving, observant, observing, understanding …c1400
observing – nouns 
– OBSERVAL † the act of observing; observation; observance …a1734