Reverse Dictionary: IRRATIONAL

ADJECTIVES
► ABERRATIONAL pert. to aberration; eccentric, irrational, or unsound → 1866
► ILLING irrational, crazy → 1985 African-American sl.
► 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.
► LOC insane, irrational, mentally unbalanced → 2001 African-American sl.
► LOC’D OUT insane, irrational, mentally unbalanced → 1995 African-American sl.
► OFF THE CHAIN crazy, irrational, out of control → 2006 African-American sl.
► WACKED UP crazy, odd, irrational → 1947 US sl.
► WACKY ► WHACKY erratic, irrational, unconventional; crazy → 1984 Aust. colloq. (Bk.)
► WILD to act violently and irrationally → 2002 US sl.

NOUNS
► AWKNESS wrongness, irrationality, perversity, untowardness, awkwardness, ineptitude → 1587 obs.
► 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.
► WILD HAIR UP YOUR ASS the notional cause of irrational, obsessive behaviour → 1981 US sl.
► WILD HAIR UP YOUR BUTT the notional cause of irrational, obsessive behaviour → 1981 US sl.

NOUNS – PERSON
► CRAZE a crazy person; a foolish or irrational person → 1831 obs.
► FANTASTICO an absurd and irrational person → 1597 obs.
► 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

PHRASES
► NOT COOKING ON ALL FOUR BURNERS not to have all of one’s faculties → 1995 US sl. (Bk.)

VERBS
► ACT THE JINNIT to play the fool; to act irrationally → 20C Irish sl.
► DOTE to act or talk foolishly, stupidly, or irrationally; to be deranged, or out of one’s wits → c1225 obs.
► FLIP OUT to lose control of one’s emotional state; to become very upset and irrational → 1995 US sl. (Bk.)
► FREAK OUT to lose control of one’s emotional state; to become very upset and irrational → 1995 US sl. (Bk.)
► 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 African-American & teen sl.
► TRIP to lose control and behave in an irrational way → 2006 African-American sl.