n.

1. An insane person.
2. A person who has an excessive enthusiasm or desire for something: a sports maniac.
3. A person who acts in a wildly irresponsible way: maniacs on the highway.

adj.

Variant of maniacal.

[From Late Latin maniacus, maniacal, from Greek maniakos, from maniā, madness.]

noun

A person who is ardently devoted to a particular subject or activity: bug, devotee, enthusiast, fanatic, zealot. Informal buff², fan², fiend. Slang freak, nut. See concern/unconcern.

adjective

Afflicted with or exhibiting irrationality and mental unsoundness: brainsick, crazy, daft, demented, disordered, distraught, dotty, insane, lunatic, mad, 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, offout ofone's head, off one's rocker, of unsound mind, out of one's mind, sick in the head, stark raving mad. See sane/insane.

One affected with mania.

IN BRIEF: n. - An insane person; A person who has an obsession with or excessive enthusiasm for something.

Tutor's tip: Anything made from "manioc," (a starchy root used in making tapioca) made the "maniac" (a mad person) even more "manic" (relating to high excitement and craze).

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Dansk (Danish)
n. - sindssyg person, maniker

Nederlands (Dutch)
fanaat, gek, maniakaal, dol

Français (French)
n. - (Psych) maniaque, (fig) passion (de), manie (de)
adj. - (Psych) maniaque, (fig) fou

Deutsch (German)
n. - Wahnsinniger, Fanatiker
adj. - manisch, wahnsinnig

Ελληνική (Greek)
n. - (ψυχολ.) μανιακός
adj. - (ψυχολ.) μανιακός, παθιασμένος, τρελός, ανισόρροπος

Italiano (Italian)
fanatico, maniaco

Português (Portuguese)
n. - maníaco (m)
adj. - maníaco

Русский (Russian)
маньяк, маниакальный

Español (Spanish)
n. - fanático, maníaco, maniático
adj. - fanático, maníaco, maniático

Svenska (Swedish)
n. - galning
adj. - galen

中文（简体） (Chinese (Simplified))
狂人, 疯子

中文（繁體） (Chinese (Traditional))
n. - 狂人, 瘋子

한국어 (Korean)
n. - 애호가, 병적인 사람

日本語 (Japanese)
n. - 狂人, 熱中者
adj. - 狂気の, 狂乱の

العربيه (Arabic)
‏(الاسم) مجنون, أهوس, , أخرق (صفه) جنوني‏

עברית (Hebrew)
n. - ‮אדם המתנהג בפראות, משוגע‬

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