Synonyms of insane in English:

insane


See definition of insane

adjective

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

SYNONYMS

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

ANTONYMS

sane

2‘he made an insane suggestion’

SYNONYMS

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

ANTONYMS

sensible

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

SYNONYMS

mad, crazy

angry, annoyed, irritated, cross, vexed, exasperated, incensed, enraged

informal aggravated, hot under the collar, foaming at the mouth

British informal spare, crackers

ANTONYMS

calm