Reverse Dictionary: IO – IRRH

IODINE – nouns
– ANARCHY iodine …1883 Amer. sl.
 
IOTA – nouns
– JOD the least particle or quantity; the least amount; a very little or small part; an iota …1596
 
IOU – nouns
– CALABASH, CALIBASH a promissory note or IOU …M19 Aust. sl.
– MARKER an IOU …1887 US sl.
– PAPER(S) any form of money order, IOU, promissory note or financial document other than actual cash …L18 sl.
– TAB the bill, credit, an IOU; used fig. to imply that an action, good, or bad, will be paid for later …L19 US sl.
– TICKET † an acknowledgement of indebtedness; an IOU; a promise to pay …c1600 obs.
 
IOWA – person
– HAWK-EYE a native or inhabitant of Iowa …1839 US colloq.
 
IRA – nouns
– RA, THE the provisional IRA …1980s sl., orig. Ulster
IRA – person 
– STICK a member of the official I.R.A. or Sinn Fein …1978 sl.
– STICKIE, STICKY a member of the official I.R.A. or Sinn Fein …1972 sl.
 
IRAN – person
– BASIJ in Iran: a member of the Basij militia, a volunteer militia founded in 1979 …1982
– BASIJI in Iran: a member of the Basij militia, a volunteer militia founded in 1979 …1982
– BAZAARI an Iranian merchant or shop owner …1978 
 
IRASCIBLE – adjectives
– ALL FIRE AND TOW irascible, excitable, hot-tempered …1838 Amer. dial. 
– ATTRIE irascible …Bk1911 Sc.
– BARMY flighty; passionate; irascible …Bk1911 Sc.
– FAIRDIE passionate, irascible …1821 Sc.
– FAST hasty in temper, irascible …Bk1900 Eng. dial.
– FAUSTY irascible, angry, low, mean, cross; pert, impertinent, impudent, self-important; frisky, mettlesome …1890 Amer. dial.
– FEISTY, FICETY irascible, argumentative, touchy, angry, low, mean, cross; pert, impertinent, impudent, self-important; frisky, mettlesome …1890 Amer. dial.
– FISTY, FYSTY irascible, angry, low, mean, cross; pert, impertinent, impudent, self-important; frisky, mettlesome …1890 Amer. dial.
– GNATTERIE peevish, crabbed, cantankerous, irascible, given to sharp caustic talk …1825 Sc.
– HAISTERED ill-done, irascible …1787 Sc.
– HASTARD irascible …Bk1902 Sc.
– IRACUND inclined to wrath; prone to anger; passionate, irascible, irritable …1821
– IGNORANT angry, irascible, short-tempered …1940s W. Indies. & UK Black sl.
– IROUS † given to anger, hot-tempered, irascible …1303
– NATTERIE peevish, crabbed, cantankerous, irascible, given to sharp caustic talk …1825 Sc.
– NERTY irascible, short-tempered …Bk1905 Eng. dial.
– NITTERIE peevish, crabbed, cantankerous, irascible, given to sharp caustic talk …1825 Sc.
– NITTERY peevish, crabbed, cantankerous, irascible, given to sharp caustic talk …1825 Sc.
– RAISED infuriated, irascible, wild, frenzied, over-excited …1704 Sc.
– SPUNKY angry, irritable, irascible …1809 Eng. & Amer. dial.
– TETCHIOUS tetchy, touchy, apt to take offense; irritable, irascible, peevish; testy, easily angered, ill-tempered …1913 Amer. dial.
– TOUCHOUS tetchy, touchy, apt to take offense; irritable, irascible, peevish; testy, easily angered, ill-tempered …1880 Amer. dial.
irascible – person
– ATTERCAP an irascible person …1892 Eng. dial.
– FICE (derogatory) a person or animal that is irascible, touchy, or bad-tempered …1915 Amer. dial.
– FISTE, FYST (derogatory) a person or animal that is irascible, touchy, or bad-tempered …1915 Amer. dial.
– MAHUGGER a sour, irascible old man …1950 Sc.
– TARTAR a savage person; a rough and violent or irritable person, an irascible person; an ill-natured, shrewish woman, a vixen, a termagant …1663
– TEARER a passionate, irascible person; a shrew, a vixen, a virago …1850 Sc.
irascible – verbs
– HAVE A BUG UP ONE’S ASS to be irascible and touchy …1954 Amer. dial.
 
IRATE – adjectives
– AERATED very lively, highly animated; overexcited; angry, irate …1912 colloq., chiefly Brit.
– AERIATED, AIRYATED of a person: overexcited; angry, irate …1974 colloq.
 
IRE – adjectives
– WRAW † angry, wrathful, vexed, fierce; characterized by anger or ire …c1205 obs. exc. Eng. dial.
ire – nouns 
– EBENEZER one’s passions, esp. ire …1836 US sl.
– GRAME † anger, wrath, ire …c1000
– NANTY temper, ire; a drubbing, a scolding …1935 Sc. sl.
ire – person 
– ASH-CAT a lazy person who crouches over the fire …1808 Eng. dial.
 
IRELAND, IRISH – adjectives
– DUNDONIAN relating to Dundee …1867
– IRELANDISH Irish; of Irish background and manners …1924 Amer. dial.
– IRISH AS MICKEY’S MOTHER, AS full-blooded Irish …1965 Amer. dial.
– IRISH AS PADDY’S PIG(S), AS fully and obviously Irish …1974 NZ & Aust. sl.
– MICK Irish …L19 sl., orig. US
– OIRISH Irish …1962 UK sl.
– PADDY Irish …20C sl.
– SHANTY IRISH (derogatory) of or belonging to people of Irish descent in poor circumstances …US
 ​- ULTONIAN belonging to Ulster …1766
Ireland, Irish – nouns 
– AMERICAN WAKE a farewell party for those emigrating to America in the late nineteenth century and early twentieth century …1986 Ireland sl.
– ANIMAL GANG members of the Fascist Blueshirt movement 1920s-1930s …Irish sl.
– FAR-DOWN Ulster …L19 Aust. sl.
– GREEN SOD Ireland …19C sl.
– MEDIUM, THE. the Irish language …20C Irish
– MURPHY LAND Ireland …M19 sl. 
– OLD DART England, or Ireland …M19 Aust. & NZ sl.
– OLD LADY OF WESTMORELAND STREET the Irish Times …M19 Irish
– OLD SOD Ireland …19C sl.
– OULD SOD Ireland …19C sl.
– PADDY-BASHING beating up Irish people, usually used of soldiers in Northern Ireland …2000s sl.
– PADDYISM an Irish peculiarity, an Irishism …1801
– PADDYLAND Ireland …19C sl.
– PADDY’S ISLE Ireland …19C sl. 
– PADDY’S LAND Ireland …19C sl.
– PAPER-SHADE IRISH lower class Irish …1967 Amer. dial.
– PATLAND Ireland …M19 sl.
– RAILROAD IRISH the Irish working class …1910s US sl.
– SHANTY IRISH (derogatory) shanty Irish people collectively …US
– SOD Ireland …19C sl.
– URINAL OF THE PLANETS (derogatory) Ireland ..17C Brit. sl.
– WOLFLAND † a former nickname for Ireland …1692
Ireland, Irish – person
– ALICKADOO a rugby club official or committee member …1997 Ireland sl.
– BAN a Lord Lieutenant of Ireland …1909 Irish sl.
– BARK an Irishman …1869 Eng. dial.
– BARK-ISLANDER an Irish person …c1850 UK sl.
– BLACK IRISH 1. an Irish person with black hair and dark complexion …Bk1998 New York sl.
2. (usually derogatory) an Irish Protestant …Bk1998 New York sl.
– BLACK PROTESTANT 1. a Protestant settler in Ireland at the time of the Cromwellian Settlement of 1652 …1829
2. (derogatory and offensive) a staunch Irish Protestant, esp. one characterized as intolerant or bigoted; also used as a more general term of abuse for an Irish Protestant …1958
– BLACK-MOUTH an Irish Protestant dissenter …1843 Ireland
– BOGLANDER an Irish person …1834 Amer. dial.
– BOG-TROTTER (derogatory) an Irish person …1682 sl.
– CASTLE CATHOLICS Irish Catholics who rejected nationalism, preferring to curry favour with and ape the lifestyle of the ruling British …E19 sl.
– CHEW an Irish person …1929 Amer. dial.
– DEAR JOY † a familiar appellation for an Irishman …1688
– DUBLIN JACKEEN a Dubliner, as opposed to a country person …M19 Anglo-Irish
– DUNDONIAN a native or inhabitant of Dundee …1861
– FAR-DOWN (formerly often derogatory) an Irish-American whose family came from the north of Ireland …1834 Amer. dial.
– FAR-DOWNER (formerly often derogatory) an Irish-American whose family came from the north of Ireland …1857 Amer. dial.
– GAELICK a homosexual Irishman …1980s US homosexual sl.
– GARDA a member of the state police force of Ireland, known as the Garda Síochána; an Irish policeman …1943
– GAS-HOUSE MICK a poor or lower-class Irish person …1912  US police sl.
– GRECIAN an Irish person …M19 sl.
– GREEK an Irish person …E19 sl.
– GURRIER orig., a Dublin street urchin; now usually: a rough, aggressive young man; a lout, a hooligan; also, a term of abuse …1936 Ireland colloq.
– HARP (often derogatory) a person of Irish birth or descent …1904 Amer. dial.
– HIBERNIAN a native of Ireland; an Irishman …1709
– HIBERNO-CELT an Irish Celt …Bk1895
– HIBERNOLOGIST a student of or authority on Hibernology (the study of Irish antiquities and history) …a1869
– HIBERNOPHOBE one who has a dread of or antipathy to the Irish …1889 nonce word
– IRISH † an Irishman …1719 obs. exc. hist. 
– IRISHER an Irishman; a person who is Irish or of Irish descent …1807 Eng. & Amer. dial.
– IRISHES † Irishmen …1650 Sc.
– JACKEEN 1. a Dubliner, as opposed to a country person …M19 Anglo-Irish
2. a nickname for a conceited Dublin citizen of the lower class …Bk1910 Ireland 
– JIB at Dublin university: a first-year’s man …Bk1896 sl.
– LACE-CURTAIN IRISH successful, middle-class Irish-Americans or Irish immigrants; Irish Americans who prospered or married well, or those having social or economic pretensions; sometimes used derisively …1929 US sl. 
– MAC an Irishman or Scotsman …1617 sl.
– MACK † a term of contempt for a Celtic Irishman …1617
– MANTLEMAN † one of the poor Irish of the fifteenth to seventeenth centuries whose clothing consisted of a single ‘mantle’ or ‘plaid’ …1633
– MANTLER † one of the poor Irish of the fifteenth to seventeenth centuries whose clothing consisted of a single ‘mantle’ or ‘plaid’ …1653
– MICK (not always derogatory) an Irishman …1856 sl.
– MICK DOOLAN an Irish immigrant; a Roman Catholic …20C NZ sl.
– MICKEY DO, MICKEY DOO an Irish immigrant; a Roman Catholic …20C NZ sl.
– MICKEY DOOLAN, MICKEY DOOLIN, MICKY DOOLAN an Irish immigrant; a Roman Catholic Irish person…20C NZ sl.
– MICKEY DOOLEY, MICKEY DOOLIE an Irish immigrant; a Roman Catholic …20C NZ sl.
– MICKEY, MICKIE, MICKY an Irishman; a man of Irish descent …1856 Amer. dial.
– MIKE a generic term for an Irishman …L19 US colloq.
– MIKEY an Irish person …M19 US sl.
– MODERATOR at Dublin University: an honours graduate; so called because, prior to reform of the curriculum in 1833, students who performed well were asked to moderate the examinations of other students …1838
– MOLLY * a member of a secret society formed in Ireland in 1843 in order to raise evictions from land for the non-payment of rent …1917
– MOLLY MAGUIRE a member of a secret society formed in Ireland in 1843 in order to resist evictions from land for the non-payment of rent by terrorizing process-servers, etc.; so called from disguising themselves in women’s clothes …1844
– MOLLY MAGUIREITE †* a member of a secret society formed in Ireland in 1843 in order to resist evictions from land for the non-payment of rent …1853
– MOLLY MALONES Dubliners …1987 Irish sl.
– MOONLIGHTER a member of an Irish secret order that began a system of outrages about 1880; their work was done at night, and their notices to those whom they intended visiting were signed “Captain Moonlight,” whence the name …1889
– MOUNTAINY MAN a man from a remote or mountainous area of Ireland; also, (derogatory) such a man regarded as ignorant, uneducated or conservative in outlook …1899 chiefly Irish English
– ORANGEMAN n. a Protestant Irishman; a Netherlander …1967 Amer. dial.
– ORANGEY a Protestant Irishman; a Netherlander …1895 Amer. dial.
– PAD 1. an Irishman …1821 sl.
2. a nickname or intimate form of address for an Irishman …1855 sl. 
– PADDY (often derogatory) an Irishman; often used as a nickname or intimate form of address …1714 colloq. 
– PADDYLANDER an Irishman …c1820 sl.
– PADDYWACK an Irishman …1871 Amer. sl.
– PADDYWHACK (chiefly derogatory) an Irishman, esp. when large and brawny …1773 colloq.
– PADDYWHACKER an Irishman; an Irish ragamuffin …1909 Amer. sl.
– PALE-MAN * an inhabitant of the English Pale in Ireland …1650 hist.
– PALESMAN an inhabitant of the English Pale in Ireland …1879 hist.
– PAT (derogatory when used as a generic term) a nickname for an Irishman …1806
– PATESS a nickname for an Irishwoman …19C
– PATLANDER an Irish person …E19 sl.
– PATTY (derogatory when used as a generic term) a nickname for an Irishman …L18
– PIG IRISH Irish people or people of Irish descent, esp. those belonging to the lower classes or retaining lower-class traits …1932 Amer. dial.
– PIGPEN IRISH Irish people or people of Irish descent, esp. those belonging to the lower classes or retaining lower-class traits …1932 Amer. dial.
– PIGSHIT IRISHMAN an Irish person or one of Irish descent, esp. one belonging to the lower classes or retaining lower-class traits …1968 Amer. dial.
– POTATO CONSUMER an Irishman … 1890 UK sl.
– POTATO HEAD an Irishman … 1983 UK sl.
– POTATO NIGGER an Irishman …2017 sl.
– RAPPAREE an Irish pikeman or irregular soldier, of the kind prominent during the war of 1688-92; hence, an Irish bandit, robber, plunderer, or freebooter; any ruffianly vagabond …1690
– RED-NECK an Irishman …1929 Amer. dial.
– SALT-WATER TURKEY (derogatory) a nickname for an Irishman who has crossed the ocean; a person of Irish descent; a Catholic …1964 Amer. sl.
– SANS-POTATO an indigent Irishman …1839
– SAVE-ALLS ‘boys running about gentlemen’s houses in Ireland, who are fed on broken meats that would otherwise be wasted’ …1785 Anglo-Irish sl.
– SHANTY IRISH Irish people or people of Irish descent; esp. those belonging to the lower classes or retaining lower-class traits …1928 Amer. dial.
– SHANTYTOWN IRISH Irish people or people of Irish descent; esp. those belonging to the lower classes or retaining lower-class traits …1965 Amer. dial.
– SHEENY an Irishman …1982 Amer. dial.
– SKANGER a member of a Dublin/Kilkenny subcultural urban adolescent, teenage, and young-adult-male grouping that is given to hanging around and causing trouble …2001 Ireland sl.
– SKEG a member of a subcultural social grouping of pubescent or adolescent girls …2001 Irish sl.
– TAD 1. a person of Irish ancestry …1914 Amer. dial.
2. an Irish Catholic …20C US sl.
– TAGUE, TAIG an Irishman …1623
– TATER-EATER an Irishman …1867 sl., chiefly US usage
– TEAGUE a nickname for an Irishman …1623 colloq. arch.
– TEAGUELANDER † an Irishman …1689
– TEG, TEIG an Irishman …M17
– TIPPERARY FORTUNE an Irish woman with no fortune other than her body …L18
– TURF-CUTTER (derogatory) an Irishman …20C sl.
– TURK (usually derogatory) a person of Irish birth or descent …1914 sl., chiefly US
– TURKEY a person of Irish descent; a Catholic …1911 Amer. dial.
– TWO-TOILET IRISH middle-class descendants of lower-class Irish immigrants …1973 Amer. dial.
– ULSTERITE a native or inhabitant of Ulster …1920
– ULSTERMAN a native or inhabitant of Ulster …1845
– ULTAGH † an Ulsterman …1649 Anglo-Irish
– ULTONIAN an inhabitant or native of Ulster …1781
– WHISKYHEAD an Irishman …1965 Amer. dial.
– YELLOW-BELLY a native or inhabitant of County Wexford in Ireland …1826
– YOUNG-IRELANDER a member or supporter of Young Ireland, an Irish political, cultural, and social movement of the mid 19th century, espousing nationalist principles and eventually playing a leading role in a failed rebellion in July, 1848 …1844
Ireland, Irish – phrases
– STRAIGHT FROM THE BOG (derogatory) used of an Irish immigrant to the UK …L19 sl.
 
IRIS – nouns
– POOR MAN’S ORCHID an iris …1966 Amer. dial.
– RAINBOW-FLOWER the Iris …Bk1914
 
IRIS – see EYE
 
IRISH – see IRELAND
 
IRK – verbs
– GET ONE’S ANGORA to irk, to annoy, to anger or exasperate someone; to discomfit or rattle one …1915 Amer. sl.
– NIRK to irk, to annoy, to harass, to weary …1861 Eng. dial.
 
IRKSOME – adjectives
– ELENGE † very long, tedious, weary, irksome …c897
– FASHIOUS troublesome, annoying, irksome …1536 Sc. & Eng. dial.
– FASHOUS troublesome, annoying, irksome; of a task: tricky, ticklish …1731 Sc.
– IMPORTUNE persistent or pressing in solicitation; pertinacious; irksome through persistency of request …1447
– TOR † difficult, hard, toilsome; irksome, tedious …c1200
– YERKSOME annoying, irksome …1883 Sc.
irksome – nouns  (includes IRKSOMENESS)
– MURDER a very irksome experience …1924 sl.
– PAINFULNESS the quality of causing trouble or labour; difficulty, troublesomeness, irksomeness …1526 arch.
 
IRON – adjectives
– IRE made of iron …1892 Eng. dial.
– IRONEN made of iron …Bk1902 Eng. dial.
– IRONY hard or strong as iron …1791 Sc.
– SIDEREOUS * composed of iron …1830
– SIDERIC * pert. to iron …1876
– SIDEROSE * similar to iron …1811
– SIDEROUS * having the qualities of iron …1811
iron – nouns 
– FARMENTS †* iron fittings …1440
– FARREMENTS †* iron fittings …1440
– GALVANISE sheets of corrugated iron …1965 Barbados
– GALVO galvanised iron …1945 Aust. sl.
– IRE iron …1777 Eng. dial.
– IRE-GEAR ironwork; ironware …1825 Eng. dial.
– IRE-STUFF ironwork …Bk1902 Eng. dial.
– MARS † in old chemistry: the metal iron …c1386
iron – person
– IRE-MONGER an ironmonger …Bk1902 Eng. dial.
– YAGER a dealer in scrap-iron …Bk1905 Eng. dial.
 
IRON MAIDEN  – interjections
– UP THE IRONS! used as a greeting, esp. between Iron Maiden fans …1995 US sl.
 
IRRATIONAL – adjectives
– ABERRATIONAL pert. to aberration; eccentric, irrational, or unsound …1866
– INSANE idiotic, utterly senseless, irrational, obsessive …M19
– JIGGERED irrational, not sound-minded  having a ‘screw loose’ …1895 Amer. dial.
– JIGGERY irrational, unstable, crazed, deranged, not sound-minded  having a ‘screw loose’ …1895 Amer. dial.
– WACKED UP crazy, odd, irrational …1947 US sl.
irrational – nouns  (includes IRRATIONALITY) 
– BESTIALITY want of intelligence; irrationality, stupidity, brutality …c1374
– IMPERTINENCES something unsuitable, out of place, trivial, or irrational; an incongruity; a trifle, absurdity, piece of folly …1603
– JAG a bout of irrational or compulsive behaviour; a period of indulgence in a particular type of behaviour …1913 Amer. dial.
irrational – person
– FANTASTICO † an absurd and irrational person …1597
– JIGGER-HEAD one who is irrational, unstable, crazed, or deranged …1895 Amer. dial.
– LOONY BIRD a person who is at least eccentric, at most mentally unstable or irrational …1964 US sl.
– WACK a crazy, zany, irrational, peculiar, eccentric, or amusing person …1938 sl., orig. US
– WACKER a crazy, zany, irrational, peculiar, eccentric, or amusing person …1965 Aust. sl.
– WACKO a crazy, eccentric, or irrational person …1977 sl., orig. & chiefly US
irrational – verbs 
– ACT THE JINNIT to play the fool; to act irrationally …20C Irish sl.
– FLIP OUT to lose control of one’s emotional state; to become very upset and irrational …Bk1995 US sl.
– FREAK OUT to lose control of one’s emotional state; to become very upset and irrational …Bk1995 US sl.
– GO BALLISTIC to go out of control; to become angry or irrational …1971 US sl.
– LUNCH to act in a silly or irrational manner; to overreact; to procrastinate …1980s US Black & teen sl.
irrational – phrases
– NOT COOKING ON ALL FOUR BURNERS not to have all of one’s faculties …Bk1995 US sl.
 
IRRECOVERABLE – adjectives
– UNCOVERLICH † irrecoverable …c1230
 
IRREFUTABLE – adjectives
– UNCONTROLLABLE † indisputable, irrefutable …1577
 
IRREGULAR – adjectives
– ABERRANT deviating widely from the ordinary or natural type, exceptional, irregular, abnormal …1830
– ABNORMOUS irregular, misshapen …1742
– ALL MAKES AND SHAPES ill or strangely formed; very irregular …Bk1905 Eng. dial.
– ECCENTRICAL exceptional, irregular …a1652
– LEFT-HANDED irregular; illicit; dubious …1612
– MINGLE-MANGLE irregular, confused, mixed …1577
– NOT IN THE BOOK not allowed, irregular
– OONWANDAN unexpected, unusual, unsteady, irregular …1929 Sc.
– RAGGLED straggling, irregular, ragged …1795 Sc.
– RAMBLE-SCRAMBLE wanting in system; confused, irregular, disorderly …1833
– SCRAWMY irregular, unshapely; lanky, large, straggling, spreading …Bk1904 Eng. dial.
– SKY-BOTTLIN crooked, lopsided, irregular …1995 Amer. dial.
– SKY-GODLIN crooked, lopsided, irregular …1869 Amer. dial.
– SKY-GOG crooked, lopsided, irregular …1916 Amer. dial.
– SKY-GOGGLIN crooked, lopsided, irregular …1953 Amer. dial.
– SKY-WADDLIN crooked, lopsided, irregular …1953 Amer. dial.
– TUMULTUARIOUS * hurriedly done; irregular, disorderly, confused; haphazard, random …1607
– UNFORMAL † irregular; not according to form …1799 Sc.
– UNREGULAR irregular, uneven; unpunctual …1868 Sc. & Eng. dial.
– UNSUITY irregular, not uniform; unequal, uneven …Bk1905 Eng. dial.
– WALL-EYED said of any odd or irregular action …20C sl.
irregular – nouns  (includes IRREGULARITY)
– ACRASY † irregularity, disorder, intemperance, excess …1596
– BRAISSILS fits and starts …Bk1911 Sc.
– DEREGLES loose habits, irregularities; deceptions, fraudulent informations …B1900 Sc.
– RAGGEDNESS irregularity, lack of uniformity …1885
– WALL-EYED JOB any work irregularly or ill done; also, any very irregular action …1847 sl.
 
IRREGULARLY – adverbs
– HAM-SAM irregularly, confusedly; hastily; in confusion or disorder …1851 Eng. dial.
– HAM-SCRAM irregularly, confusedly; hastily; in confusion or disorder …1851 Eng. dial.
– HIM-SAM irregularly, confusedly; hastily; in confusion or disorder …1851 Eng. dial.
 
IRRELEVANCE – nouns
– ALSO-RAN a useless person; a failure; an irrelevance …L19 sl., orig. Aust. horse-racing usage
 
IRRELEVANT – adjectives
– FARTING trivial, irrelevant …1930s sl.
– IMMATESTICLE immaterial, irrelevant, of no concern …1967 Amer. dial.
– IMMATISTICAL immaterial, irrelevant, of no concern …1967 Amer. dial.
– STRAVAGANT † irrelevant, unsuitable …1565
– TANGENT ‘flying off at a tangent’; divergent, irrelevant, erratic …1787
– X’ED OUT used of something that, while once important, is no longer relevant …1970s US Black sl.
irrelevant – nouns 
– ANCIENT HISTORY the past or a past event considered as no longer relevant, important, or interesting …1838 colloq.
– IMPERTINENT † an irrelevant matter …1628
– STRAVAGANT † something irrelevant …1565
irrelevant – verbs
– LEAN BESIDE THE CUSHION † to miss the point; to beside the mark; to be irrelevant …1576
– X OUT to dismiss something as no longer important or relevant …1970s US Black sl.
 
IRRELEVANTLY – adverbs
– UNAPPOSITELY irrelevantly …1680
– VAGRANTLY † irrelevantly …1547
 
IRRELIGIOUS – adjectives
– UNCIRCUMCISED not spiritually chastened or purified; irreligious; heathen …a1400
irreligious – person
– ZENDIK an adherent of any of various sects considered to be heretical; a heretic; an irreligious person; chiefly with reference to Persia or the Ottoman Empire …1667
– ZINDICK an adherent of any of various sects considered to be heretical; a heretic; an irreligious person; chiefly with reference to Persia or the Ottoman Empire …1667
– ZINDIQ an adherent of any of various sects considered to be heretical; a heretic; an irreligious person; chiefly with reference to Persia or the Ottoman Empire …1667
 
IRREMEDIABLE – adjectives
– UNBOTELICH † irremediable …c1230
– UNREMEADFUL † irremediable …1814 Sc.
 
IRREPARABLE – adjectives
– WACKED beyond repair …1997 UK sl.
 
IRREPROACHABLE – adjectives
– SANCTORUM † irreproachable …1824
 
IRRESISTIBLY – adverbs
– UNAGAINSTANDABLY † irresistibly …c1449
 
IRRESOLUTE – adjectives
– BACKING AND FILLING irresolute; dilatory; hesitant; shifty …c1840 Eng. colloq.
– BINGLE-BANGLE fickle, vacillating, irresolute …1825 Eng. dial.
– BRANLING † wavering, vacillating, irresolute …c1645
– UNDERF † irresolute, weak …a1225
– WAFFLE changeable, irresolute; feeble, weak; worthless …1867 Sc.
irresolute – person 
– BETTY a weak-minded, irresolute person …Bk1898 Eng. dial.
– HESITATER one who hesitates, wavers, or is irresolute; a waverer …1853
– LIMBERHAM an irresolute or vacillating person …a1704
– SCONE a weak-willed, irresolute person; one who is easily imposed on, a softie …1969 Sc.
– TAFFY a weak-minded, thoughtless, irresolute person …Bk1905 Eng. dial.
– TAFFY-HORN a weak-minded, thoughtless, irresolute person …Bk1905 Eng. dial.
– TAFFY-NODDLES a weak-minded, thoughtless, irresolute person …Bk1905 Eng. dial.
– TAFFY-NOODLE a weak-minded, thoughtless, irresolute person …Bk1905 Eng. dial.
– TAFFY-WATTY a weak-minded, thoughtless, irresolute person …Bk1905 Eng. dial.
– VACILLATOR one who vacillates or wavers; an irresolute person …1890
irresolute – verbs
– HANG IN THE WIND to be or remain in dubious suspense; to be doubtful, undecided; to be irresolute, to vacillate …1555
irresolute – phrases
– COULDN’T LAST A ROUND IN A REVOLVING DOOR weak or irresolute …Bk1999 Aust. sl.
 
IRRESOLUTION – nouns
– BRANLING †* a wavering; an instance of irresolution or vacillation …1646
– SHILLY-SHALLYING irresolution …Bk1913-17 Amer. dial.
irresolution – verbs 
– BACK AND FILL to move hesitantly, to hesitate, to be irresolute …B1840 orig. Eng. nautical
– BACKING AND FILLING shiftiness; irresolution …E18 colloq.
– DACKER to remain or hang on in a state of irresolution; to vacillate, equivocate, waver …1818 Sc. & N. Eng. dial.
– HAFFLE AND CAFFLE to shilly-shally …1896 Eng. dial.
 
IRRESPONSIBLE – adjectives
– ACCOUNTLESS † free from accountableness; irresponsible …1655
– ANTIC irresponsible, ungovernable, wild …1936 Amer. dial.
– BUBBLE-HEADED out of touch with reality, empty-headed, daft, silly, irresponsible …1952 sl., orig. US
– COCKAMAMIE out of touch with reality, empty-headed, daft, silly, irresponsible …1950 US sl.
– COCKAMAMY out of touch with reality, empty-headed, daft, silly, irresponsible …1950 US sl.
– COCKAMANIE out of touch with reality, empty-headed, daft, silly, irresponsible …1950 US sl.
– COCKAMANY out of touch with reality, empty-headed, daft, silly, irresponsible …1950 US sl.
– DILLY out of touch with reality, empty-headed, daft, silly, irresponsible …1905 sl., chiefly Aust.
– DITSEY scatterbrained, irresponsible …1976 Amer. dial.
– DITSY out of touch with reality, empty-headed, daft, silly, irresponsible …1973 sl., orig. US
– DITZY out of touch with reality, empty-headed, daft, silly, irresponsible …1973 sl., orig. US
– DIVVY out of touch with reality, empty-headed, daft, silly, irresponsible …1975 Brit. sl.
– DIVY out of touch with reality, empty-headed, daft, silly, irresponsible …1975 Brit. sl.
– DIZZY out of touch with reality, empty-headed, daft, silly, irresponsible …1878 sl.
– GOOFY out of touch with reality, empty-headed, daft, silly, irresponsible …1919 sl., orig. US
– GOOPY out of touch with reality, empty-headed, daft, silly, irresponsible …1926 sl., orig. US 
– HAIRY-CUM-STAIRY harum-scarum, reckless, rash; irresponsible …1919 Sc.
– IRRE-FUCKING-SPONSIBLE extremely irresponsible …20C sl.
– RAMSTOUGAR irresponsible, harebrained, heedless …1825 Sc.
– ROGUE uncontrolled, undisciplined, irresponsible …M20
– UNACCOUNTABLE irresponsible, failing in memory, esp. used of old people …Bk1905 Eng. dial.
irresponsible – nouns
– ANDRAMARTINS irresponsible or frivolous behaviour …Irish sl.
– ANDREMARTINS irresponsible or frivolous behaviour …Irish sl.
– ANDREW MARTINING irresponsible or frivolous behaviour …Irish sl.
irresponsible – person 
– AIRHEAD a flighty, irresponsible person …1971 sl.
– BILDERT a term of contempt; a slightly mischievous, irresponsible youth; a rascal …Bk1892 Sc. & Eng. dial.
– DILLIGAF an irresponsible person (Do I Look Like I Give A Fuck?) …US Vietnam War usage
– DILLIGAS an irresponsible person (Do I Look Like I Give A Shit?) …US Vietnam War usage
– GAMSTER a giddy, irresponsible or frivolous woman …c1920 Sc.
– GAPIE a stupid, gaping, or irresponsible person; a fool …1908 Sc.
– GAPPY a stupid, gaping, or irresponsible person; a fool …1908 Sc.
– GIDDY GOAT an irresponsible fool …Bk1958 Eng. sl.
– HEEFUS a person who does not act responsibly, characterized by incompetence …Bk1971 Boonville California jargon
– HEN-WIFE a cotquean, a coarse, vulgar, scolding woman; a feckless. irresponsible, or shiftless female …Bk1886 Eng. dial.
– LALLYGAG a wastrel, a wasteful or good-for-nothing person; an irresponsible person …1940s sl.
– LOLLYGAG a wastrel, a wasteful or good-for-nothing person; an irresponsible person …1940s sl.
– MO-DICKER a despicable or contemptible person; a lazy, irresponsible person …1968-70 Amer. sl.
– ONTAKER an irresponsible or untrustworthy person, esp. one who runs up debt …1914 Sc.
– PISS ARTIST a drunkard; a person who fools about; a feckless or irresponsible person …1962 colloq.
– SKATE a disreputable White male, from a working-class background, whose behaviour is uncouth, hedonistic, and irresponsible …1970s S. Afr. sl.
irresponsible – verbs
– ARSE AROUND to idle, to loaf, to loiter, to fool about, to act irresponsibly, to trifle …1664
– ASS AROUND to fool around, to loiter, to waste time; to wander aimlessly; to be idle; to act irresponsibly; to trifle …1914 Amer. sl.
– HOON to behave in a loutish or irresponsible way; to drive fast or recklessly …1983 Aust. & NZ colloq.
– PLAY TAM-TRAM to play fast and loose; to act recklessly, unreliably, irresponsibly, immorally, or thoughtlessly …1866 Sc.
– PLAY THE GIDDY GOAT to frolic, to fool about, to act irresponsibly
– PLAY THE GOAT to frolic, to fool about, to act irresponsibly
– SHUCK AND JIVE to act irresponsibly; to fool around …1970 Amer. dial.
– TIG-TOW to play fast and loose with; to behave irresponsibly or immorally; to act capriciously; to dally with …1864 Sc.
irresponsibly – adverbs
– UNACCOUNTABLY † without being liable to be called to account; irresponsibly …1679