lunatic

I

(New American Roget's College Thesaurus)

n. madman, bedlamite, maniac, psychopath. See insanity.

II

(Roget's IV) modif.

1. [Insane]

Syn. demented, deranged, psychotic; see insane 1 .

2. [Foolish]

Syn. irrational, idiotic, daft; see stupid 1 .

n.

Syn. maniac, demoniac, insane person; see madman , neurotic .

III

(Roget's 3 Superthesaurus)

I

n.

psychopath, maniac, madman, psychotic, sociopath, *schizo, *psycho, *whacko, *nut, *kook, *loony, *screwball, crackbrain. see insanity

II

a.

see crazy

IV

(Roget's Thesaurus II) I adjective 1. Afflicted with or exhibiting irrationality and mental unsoundness: brainsick, crazy, daft, demented, disordered, distraught, dotty, insane, mad, maniac, maniacal, mentally ill, moonstruck, off, touched, unbalanced, unsound, wrong. Informal: bonkers, cracked, daffy, gaga, loony. Slang: bananas, batty, buggy, cuckoo, fruity, loco, nuts, nutty, screwy, wacky. Chiefly British: crackers. Law: non compos mentis. Idioms: around the bend, crazy as a loon, mad as a hatter, not all there, nutty as a fruitcake, off (or out of) one's head, off one's rocker, of unsound mind, out of one's mind, sick in the head, stark raving mad. See SANE. 2. So senseless as to be laughable: absurd, foolish, harebrained, idiotic, imbecilic, insane, mad, moronic, nonsensical, preposterous, silly, softheaded, tomfool, unearthly, zany. Informal: cockeyed, crazy, loony, loopy. Slang: balmy2, dippy, dopey, jerky, sappy, wacky. See ABILITY, KNOWLEDGE. II noun A person regarded as strange, eccentric, or crazy: crackpot, crazy, eccentric. Informal: crank, loon, loony. Slang: cuckoo, ding-a-ling, dingbat, kook, nut, screwball, weirdie, weirdo. See WISE.