Synonyms for (adjective) insane

Synonyms: insane

Definition: afflicted with or characteristic of mental derangement

Usage: was declared insane; insane laughter

Similar words: amok, amuck, berserk, demoniac, demoniacal, possessed

Definition: frenzied as if possessed by a demon

Usage: the soldier was completely amuck; berserk with grief; a berserk worker smashing windows


Similar words: cracked, crackers, daft, dotty, haywire, round the bend, loco, loony, loopy, kookie, kooky, balmy, barmy, bats, batty, around the bend, wacky, whacky, buggy, bonkers, nuts, nutty, fruity

Definition: informal or slang terms for mentally irregular

Usage: it used to drive my husband balmy


Similar words: disturbed, demented, crazy, mad, unbalanced, unhinged, sick, brainsick

Definition: affected with madness or insanity

Usage: a man who had gone mad


Similar words: certifiable, certified

Definition: fit to be certified as insane (and treated accordingly)


Similar words: idiotic, crackbrained

Definition: insanely irresponsible

Usage: an idiotic idea


Similar words: crazed, deranged, half-crazed

Definition: driven insane


Similar words: touched, fey

Definition: slightly insane


Similar words: hebephrenic

Definition: suffering from a form of schizophrenia characterized by foolish mannerisms and senseless laughter along with delusions and regressive behavior


Similar words: lunatic, moonstruck

Definition: insane and believed to be affected by the phases of the moon


Similar words: maniac, maniacal

Definition: wildly disordered

Usage: a maniacal frenzy


Similar words: manic-depressive

Definition: suffering from a disorder characterized by alternating mania and depression


Similar words: maniclike

Definition: resembling the mania of manic-depressive illness


Similar words: mentally ill, unsound, unstable

Definition: suffering from severe mental illness

Usage: of unsound mind


Similar words: of unsound mind, non compos mentis

Definition: not of sound mind, memory, or understanding; in law, not competent to go to trial


Similar words: paranoid

Definition: suffering from paranoia


Similar words: psychopathic, psychopathologic, psychopathological

Definition: suffering from an undiagnosed mental disorder


Similar words: psychotic

Definition: characteristic of or suffering from psychosis


Similar words: raving mad, wild

Definition: talking or behaving irrationally

Usage: a raving lunatic


Similar words: schizophrenic

Definition: suffering from some form of schizophrenia

Usage: schizophrenic patients


Similar words: screw-loose, screwy

Definition: not behaving normally


Synonyms: harebrained, insane, mad

Definition: very foolish

Usage: harebrained ideas; took insane risks behind the wheel; a completely mad scheme to build a bridge between two mountains

Similar words: foolish

Definition: devoid of good sense or judgment

Usage: foolish remarks; a foolish decision