Synonyms of insane in English:


See definition of insane


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, stark staring mad, away with the fairies, not all there, bonkers, cracked, batty, 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, barking, barking mad, off one's trolley, round the twist, as daft as a brush, not the full shilling

North American informal buggy, nutsy, nutso, out of one's tree, wacko, squirrelly

Canadian NZ Australian informal bushed

NZ 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 potty, crazy, mad, off beam, way out, full of holes, cock-eyed

British informal daft, barmy



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