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lunatic

[loo-nuh-tik] /ˈlu nə tɪk/
noun
1.
(no longer in technical use; now considered offensive) an insane person.
2.
a person whose actions and manner are marked by extreme eccentricity or recklessness.
3.
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).
4.
(no longer in technical use; now considered offensive) insane.
5.
characteristic or suggestive of lunacy; wildly or recklessly foolish.
6.
Older Use. designated for or used by the insane:
a lunatic asylum.
7.
gaily or lightheartedly mad, frivolous, eccentric, etc.:
She has a lunatic charm that is quite engaging.
Origin
1250-1300
1250-1300; Middle English lunatik < Old French lunatique < Late Latin lūnāticus moonstruck. See Luna, -atic
Related forms
lunatically, adverb
half-lunatic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for more lunatic

lunatic

/ˈluːnətɪk/
adjective
1.
an archaic word for insane
2.
foolish; eccentric; crazy
noun
3.
a person who is insane
Derived Forms
lunatically, adverb
Word Origin
C13 (adj) via Old French from Late Latin lūnāticus crazy, moonstruck, from Latin lūna moon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for more lunatic

lunatic

adj.

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."

n.

"lunatic person," late 14c., from lunatic (adj.).

Online Etymology Dictionary, © 2010 Douglas Harper
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more lunatic in the Bible

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.)

Easton's 1897 Bible Dictionary
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