Synonyms of insane in English:


See US English definition of insane

See UK English definition of insane

See Spanish definition of demente


1‘she was examined by three doctors and declared insane’

mentally ill, severely mentally disordered, of unsound mind, certifiable, psychotic, schizophrenic
mad, mad as a hatter, mad as a March hare, deranged, demented, out of one's mind, out of one's head, not in one's right mind, sick in the head, unhinged, unbalanced, unstable, disturbed, crazed, crazy, hysterical
non compos mentis
British sectionable
informal raving mad, stark raving mad, not all there, bonkers, cracked, bats, cuckoo, loony, loopy, nuts, nutty, nutty as a fruitcake, screwy, bananas, off one's rocker, off one's head, off one's chump, off one's nut, off the wall, round the bend
British informal crackers, barmy, batty, barking, barking mad, stark staring mad, off one's trolley, round the twist, as daft as a brush, not the full shilling, away with the fairies
North American informal buggy, nutsy, nutso, out of one's tree, wacko, squirrelly
Canadian, Australian, New Zealand informal bushed
New Zealand informal porangi


2‘he made an insane suggestion’

extremely foolish, idiotic, stupid, silly, senseless, nonsensical, pointless, absurd, ridiculous, ludicrous, farcical, laughable, preposterous, weird, bizarre, fatuous, inane, imbecilic, moronic, asinine, mindless, hare-brained, half-baked, ill-conceived
impracticable, untenable, implausible, unreasonable, irrational, illogical, unrealistic, unthinkable
informal crazy, mad, off beam, way out, full of holes, cock-eyed
British informal daft, barmy, potty


3‘the fly's buzzing had been driving me insane’

mad, crazy
angry, annoyed, irritated, cross, vexed, exasperated, incensed, enraged
informal aggravated, hot under the collar, foaming at the mouth
British informal spare, crackers