INSANE

Pronunciation (US):

 Dictionary entry overview: What does insane mean? 

• INSANE (adjective)
  The adjective INSANE has 2 senses:

1. afflicted with or characteristic of mental derangement
2. very foolish

  Familiarity information: INSANE used as an adjective is rare.

 Dictionary entry details 

• INSANE (adjective)

Meaning:

Afflicted with or characteristic of mental derangement

Context examples:

was declared insane / insane laughter

Similar:

maniac; maniacal (wildly disordered)

schizophrenic (suffering from some form of schizophrenia)

manic-depressive (suffering from a disorder characterized by alternating mania and depression)

maniclike (resembling the mania of manic-depressive illness)

mentally ill; unsound; unstable (suffering from severe mental illness)

non compos mentis; of unsound mind (not of sound mind, memory, or understanding; in law, not competent to go to trial)

paranoid (suffering from paranoia)

psychopathic; psychopathologic; psychopathological (suffering from an undiagnosed mental disorder)

psychotic (characteristic of or suffering from psychosis)

lunatic; moonstruck (insane and believed to be affected by the phases of the moon)

hebephrenic; schizophrenic (suffering from a form of schizophrenia characterized by foolish mannerisms and senseless laughter along with delusions and regressive behavior)

screw-loose; screwy (not behaving normally)

amok; amuck; berserk; demoniac; demoniacal; possessed (in a murderous frenzy as if possessed by a demon)

around the bend; balmy; barmy; bats; batty; bonkers; buggy; cracked; crackers; daft; dotty; fruity; haywire; kookie; kooky; loco; loony; loopy; nuts; nutty; round the bend; wacky; whacky (informal or slang terms for mentally irregular)

brainsick; crazy; demented; distracted; disturbed; mad; sick; unbalanced; unhinged (affected with madness or insanity)

certifiable; certified (fit to be certified as insane (and treated accordingly))

crackbrained; idiotic (insanely irresponsible)

crazed; deranged; half-crazed (driven insane)

fey; touched (slightly insane)

raving; raving mad; wild (talking or behaving irrationally)

Also:

irrational (not consistent with or using reason)

unreasonable (not reasonable; not showing good judgment)

Antonym:

sane (mentally healthy; free from mental disorder)

Meaning:

Very foolish

Synonyms:

harebrained; insane; mad

Context examples:

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

Similar:

foolish (devoid of good sense or judgment)