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
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