Roget's Thesaurus: Entry 503 (Insanity)

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#503. Insanity. -- N. disordered reason, disordered intellect; diseased mind, unsound mind, abnormal mind; derangement, unsoundness; psychosis; neurosis; cognitive disorder; affective disorder[obs].

insanity, lunacy; madness &c. adj.; mania, rabies, furor, mental alienation, aberration; paranoia, schizophrenia; dementation[obs], dementia, demency[obs]; phrenitis[obs], phrensy[obs], frenzy, raving, incoherence, wandering, delirium, calenture of the brain[obs]; delusion, hallucination; lycanthropy[obs]; brain storm|!.

vertigo, dizziness, swimming; sunstroke, coup de soleil[Fr], siriasis[obs].

fanaticism, infatuation, craze; oddity, eccentricity, twist, monomania (caprice) 608; kleptodipsomania[obs]; hypochondriasis &c. (low spirits) 837[Med]; melancholia, depression, clinical depression, severe depression; hysteria; amentia[obs].

screw loose, tile loose, slate loose; bee in one's bonnet, rats in the upper story.

dotage &c. (imbecility) 499.

V. be insane &c. adj.

become insane &c. adj; lose one's senses, lose one's reason, lose one's faculties, lose one's wits; go mad, run mad, lose one's marbles [coll.], go crazy, go bonkers [coll.], flip one's wig [coll.], flip one's lid[coll.], flip out[coll.], flip one's bush [coll.].

rave, dote, ramble, wander; drivel &c. (be imbecile) 499; have a screw loose &c. n., have a devil; avoir le diable au corps[Fr]; lose one;s head &c. (be uncertain) 475.

render mad, drive mad &c adj.; madden, dementate[obs], addle the wits, addle the brain, derange the head, infatuate, befool[obs]; turn the brain, turn one's head; drive one nuts [coll.].

Adj. insane, mad, lunatic ,loony[coll.]; crazy, crazed, aliene[obs], non compos mentis; not right, cracked, touched; bereft of reason; all possessed, unhinged, unsettled in one's mind; insensate, reasonless, beside oneself, demented, daft; phrenzied[obs], frenzied, frenetic; possessed, possessed with a devil; deranged, maddened, moonstruck; shatterpated[obs]; mad-brained, scatter brained, shatter brained, crackbrained; touched, tetched [dialect]; off one's head.

[behavior suggesting insanity] maniacal; delirious, lightheaded, incoherent, rambling, doting, wandering; frantic, raving, stark staring mad, stark raving mad, wild-eyed, berserk; delusional, hallucinatory.

[behavior somewhat resembling insanity] corybantic[obs], dithyrambic; rabid, giddy, vertiginous, wild; haggard, mazed; flighty; distracted, distraught; depressed; agitated, hyped up; bewildered &c. (uncertain) 475.

mad as a March hare, mad as a hatter; of unsound mind &c. n.; touched in one's head, wrong in one's head, not right in one's head, not in one's right mind, not right in one's wits, upper story; out of one's mind, out of one's wits, out of one's skull [coll.], far gone, out of one's senses, out of one's wits; not in one's right mind.

fanatical, infatuated, odd, eccentric; hypped[obs], hyppish[obs]; spaced out [coll.].

imbecile, silly, &c. 499.

Adv. like one possessed.

Phr. the mind having lost its balance; the reason under a cloud; tet exaltee[French], tet montee[French]; ira furor brevis est[Latin]; omnes stultos insanire [Latin][Horace].