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[loo-nuh-tik] /ˈlu nə tɪk/

(no longer in technical use; now considered offensive) an insane person.
a person whose actions and manner are marked by extreme eccentricity or recklessness.
a person legally declared to be of unsound mind and who therefore is not held capable or responsible before the law: a former legal term.
adjective, Also, lunatical
[loo-nat-i-kuh l] /luˈnæt ɪ kəl/ (Show IPA), (for defs 4, 5, 7).
(no longer in technical use; now considered offensive) insane.
characteristic or suggestive of ; wildly or recklessly foolish.
Older Use. designated for or used by the insane:
a lunatic asylum.
gaily or lightheartedly mad, frivolous, eccentric, etc.:
She has a lunatic charm that is quite engaging.
an archaic word for insane
foolish; eccentric; crazy
a person who is insane

late 13c., “affected with periodic insanity, dependent on the changes of the moon,” from Old French lunatique, lunage “insane,” or directly from Late Latin lunaticus “moon-struck,” from Latin luna “moon” (see Luna). Cf. Old English monseoc “lunatic,” literally “moon-sick;” Middle High German lune “humor, temper, mood, whim, fancy” (German Laune), from Latin luna. Cf. also New Testament Greek seleniazomai “be epileptic,” from selene “moon.” Lunatic fringe (1913) apparently was coined by U.S. politician Theodore Roosevelt.

Then, among the wise and high-minded people who in self-respecting and genuine fashion strive earnestly for peace, there are foolish fanatics always to be found in such a movement and always discrediting it — the men who form the lunatic fringe in all reform movements. [Theodore Roosevelt, autobiography, 1913].

Earlier it was a term for a type of hairstyle worn over the forehead (1877). Lunatic soup (1933) was Australian slang for “alcoholic drink.”


“lunatic person,” late 14c., from lunatic (adj.).

probably the same as epileptic, the symptoms of which disease were supposed to be more aggravated as the moon increased. In Matt. 4:24 “lunatics” are distinguished from demoniacs. In 17:15 the name “lunatic” is applied to one who is declared to have been possessed. (See DAEMONIAC.)


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  • Lunatic-fringe

    noun 1. members on the periphery of any group, especially political, social, or religious, who hold extreme or fanatical views. noun 1. the members of a society or group who adopt or support views regarded as extreme or fanatical Derogatory name for the extreme radical members of a group, especially in politics: “The candidate referred […]

  • Lunation

    [loo-ney-shuh n] /luˈneɪ ʃən/ noun 1. the period of time from one new moon to the next (about 29½ days); a lunar month. /luːˈneɪʃən/ noun 1. another name for synodic month See month (sense 6) n. “time from one new moon to another,” late 14c., from Medieval Latin lunationem, from luna “moon” (see Luna).

  • Lunchbox

    [luhnch-boks] /ˈlʌntʃˌbɒks/ noun 1. a small container, usually of metal or plastic and with a handle, for carrying one’s from home to school or work. /ˈlʌntʃˌbɒks/ noun 1. a container for carrying a packed lunch 2. (Brit & Austral, jocular) a man’s genitals noun a container for regularly carrying one’s midday meal; also written lunch […]

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