ROGET'S THESAURUS OF ENGLISH WORDS AND PHRASES ...

insanity, lunacy; madness &c adj.; mania, rabies, furor, mental alienation, aberration;
paranoia, schizophrenia; dementation † , dementia, demency † ; phrenitis † , phrensy † , frenzy,
raving, incoherence, wandering, delirium, calenture of the brain † ; delusion, hallucination;
lycanthropy † ; brain storm † .
vertigo, dizziness, swimming; sunstroke, coup de soleil [Fr.], siriasis † .
fanaticism, infatuation, craze; oddity, eccentricity, twist, monomania (caprice) 608;
kleptodipsomania † ; hypochondriasis [Med.] &c (low spirits) 837; melancholia,
depression, clinical depression, severe depression; hysteria; amentia † .
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 † , addle the wits, addle the brain,
derange the head, infatuate, befool † ; turn the brain, turn one's head; drive one nuts
[Coll.].
Adj. insane, mad, lunatic, loony [Coll.]; crazy, crazed, aliene † , 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 † , frenzied, frenetic;
possessed, possessed with a devil; deranged, maddened, moonstruck; shatterpated † ; madbrained,
scatter brained, shatter brained, crackbrained; touched, tetched [Coll.]; 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 † , 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 † , hyppish † ; 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 [Fr.], tet
montee [Fr.]; ira furor brevis est [Lat.]; omnes stultos insanire [Lat.] [Horace].
504. Madman -- N. madman, lunatic, maniac, bedlamite † , candidate for Bedlam, raver † ,
madcap, crazy; energumen † ; automaniac † , monomaniac, dipsomaniac, kleptomaniac;
hypochondriac &c (low spirits);; crank, Tom o'Bedlam.
dreamer &c 515; rhapsodist, seer, highflier † , enthusiast, fanatic, fanatico [Sp.]; exalte
[Fr.]; knight errant, Don Quixote.