Lunatic

• POS: Adjective, Noun
• HYPHEN: lu=na=tic

CIDE DICTIONARY

Lunatic, a. [F. lunatique, L. lunaticus, fr. luna the moon. See Lunar.].

•  Affected by lunacy; insane; mad; crazy; demented.  [1913 Webster]

  "Lord, have mercy on my son; for he is lunatic."  [1913 Webster]
•  Of or pertaining to, or suitable for, an insane person; evincing lunacy; as, lunatic gibberish; a lunatic asylum.  [1913 Webster]

Lunatic, n. 

 A person affected by lunacy; an insane person, esp. one who has lucid intervals; a madman; a person of unsound mind.  [1913 Webster]
"The lunatic, the lover, and the poet,
Are of imagination all compact."  [1913 Webster]

OXFORD DICTIONARY

Lunatic, n. & adj.
--n.
1 an insane person.
2 someone foolish or eccentric.
--adj. mad, foolish.

Idiom

lunatic asylum hist. a mental home or hospital. lunatic fringe an extreme or eccentric minority group.

Etymology

ME f. OF lunatique f. LL lunaticus f. L luna moon

THESAURUS

Lunatic

abnormal, absurd, aliene, ass, balmy, batty, bedlamite, bereft of reason, borderline case, born fool, brainsick, buffoon, clown, crackbrain, crackbrained, cracked, crackpot, crank, crazed, crazy, cuckoo, daft, deluded, dement, demented, demoniac, deprived of reason, deranged, ding-a-ling, disoriented, distraught, doodle, egregious ass, energumen, fanatic, fantastic, figure of fun, flake, flighty, fool, fou, hallucinated, harebrain, idiot, ignoramus, insane, irrational, jackass, kook, loco, loon, loony, mad, maddened, madman, maniac, manic, mazed, mental, mentally deficient, meshuggah, meshuggenah, milksop, moon-struck, mooncalf, neuropath, neurotic, non compos, non compos mentis, noncompos, not all there, not right, nut, odd, of unsound mind, off, paranoid, perfect fool, phrenetic, potty, preposterous, psycho, psychoneurotic, queer, raver, raving lunatic, reasonless, schmuck, screwball, senseless, sick, softhead, sop, stark-mad, stark-staring mad, strange, stupid ass, tetched, tomfool, touched, unbalanced, unhinged, unsane, unsettled, unsound, wacky, wandering, weirdo, witless, zany

ROGET THESAURUS

Lunatic

Insanity

N insanity, disordered reason, disordered intellect, diseased mind, unsound mind, abnormal mind, derangement, unsoundness, psychosis, neurosis, cognitive disorder, affective disorder, insanity, lunacy, madness, 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, siriasis, fanaticism, infatuation, craze, oddity, eccentricity, twist, monomania (caprice), kleptodipsomania, hypochondriasis, 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, insane, mad, lunatic, loony, 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, mad-brained, scatter brained, shatter brained, crackbrained, touched, tetched, off one's head, maniacal, delirious, lightheaded, incoherent, rambling, doting, wandering, frantic, raving, stark staring mad, stark raving mad, wild-eyed, berserk, delusional, hallucinatory, corybantic, dithyrambic, rabid, giddy, vertiginous, wild, haggard, mazed, flighty, distracted, distraught, depressed, agitated, hyped up, bewildered, mad as a March hare, mad as a hatter, of unsound mind, 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, 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, imbecile, silly, like one possessed, the mind having lost its balance, the reason under a cloud, tet exaltee, tet montee, ira furor brevis est, omnes stultos insanire.

Madman

N madman, lunatic, maniac, bedlamite, candidate for Bedlam, raver, madcap, crazy, energumen, automaniac, monomaniac, dipsomaniac, kleptomaniac, hypochondriac (low spirits), crank, Tom o'Bedlam, dreamer, rhapsodist, seer, highflier, enthusiast, fanatic, fanatico, exalte, knight errant, Don Quixote, idiot.