Reverse Dictionary: IRRESPONSIBLE

ADJECTIVES
► ACCOUNTLESS free from accountableness; irresponsible → 1655 obs.
► ANTIC irresponsible, wild, ungovernable → 1936 Amer. dial.
► ASLEEP AT THE SWITCH irresponsible, absent-minded → 1990 Amer. dial. (Bk.)
► BUBBLE-HEADED out of touch with reality, empty-headed, daft, silly, irresponsible → 1952 sl., orig. US
► COCKAMAMIE ► COCKAMAMY ► COCKAMANIE ► 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 ► DITSY ► DITZY out of touch with reality, empty-headed, daft, silly, irresponsible → 1973 sl., orig. US
► DIVVY ► 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
► TRIGGER-HAPPY reckless, irresponsible, foolhardy, especially in matters which could lead to violence or war → 1984 Aust. colloq. (Bk.)
► UNACCOUNTABLE irresponsible, failing in memory, esp. used of old people → 1905 Eng. dial. (Bk.)

ADVERBS
► UNACCOUNTABLY without being liable to be called to account; irresponsibly → 1679 obs.

NOUNS
► ANDRAMARTINS ► ANDREMARTINS irresponsible or frivolous behaviour → Irish sl.
► ANDREW MARTINING irresponsible or frivolous behaviour → Irish sl.

NOUNS – PERSON
► AIRHEAD a flighty, irresponsible person → 1971 sl.
► BABY BOY an insignificant and irresponsible man → 2005 African-American sl.
► BILDERT a term of contempt; a slightly mischievous, irresponsible youth; a rascal → 1892 Sc. & Eng. dial. (Bk.)
► BLOW a person who goes on a drinking spree; an irresponsible person; one who spends much money on entertainment and nonessential items → c1850 US sl.
► BUM a worthless or contemptible person; a lazy or irresponsible person → 1882 derogatory
► 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 ► GAPPY a stupid, gaping, or irresponsible person; a fool → 1908 Sc.
► GIDDY GOAT an irresponsible fool → 1958 Eng. sl. (Bk.)
► HEEFUS a person who does not act responsibly, characterized by incompetence → 1971 Boonville California jargon (Bk.)
► HEN-WIFE a cotquean, a coarse, vulgar, scolding woman; a feckless. irresponsible, or shiftless female → 1886 Eng. dial. (Bk.)
► LALLYGAG ► 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 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.

PHRASES
► ALL FRONT AND NO BACK DOOR said of a phony, an irresponsible person, or a pretender → 1990 Amer. dial. (Bk.)
► NEEDS A WET-NURSE said of an ignorant or irresponsible person → 1945 US Western usage (Bk.)

VERBS
► ARSE AROUND ► ASS AROUND to idle, to loaf, to loiter, to fool about, to act irresponsibly, to trifle → 1664
► 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 US students’ sl. (Bk.)
► TIG-TOW to play fast and loose with; to behave irresponsibly or immorally; to act capriciously; to dally with → 1864 Sc.