lu·na·tic

[loo-nuh-tik]
noun
1.
an insane person.
2.
a person whose actions and manner are marked by extreme eccentricity or recklessness.
3.
Law. a person legally declared to be of unsound mind and who therefore is not held capable or responsible before the law.
adjective Also, lu·nat·i·cal [loo-nat-i-kuhl] , (for defs 4, 5, 7).
4.
insane; demented; crazy.
5.
characteristic or suggestive of lunacy; wildly or recklessly foolish.
6.
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.
00:10
Lunatic is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a stew of meat, vegetables, potatoes, etc.

Origin:
1250–1300; Middle English lunatik < Old French lunatique < Late Latin lūnāticus moonstruck. See Luna, -atic

lu·nat·i·cal·ly, adverb
half-lu·na·tic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
lunatic (ˈluːnətɪk) [Click for IPA pronunciation guide]
 
adj
1.  an archaic word for insane
2.  foolish; eccentric; crazy
 
n
3.  a person who is insane
 
[C13 (adj) via Old French from Late Latin lūnāticus crazy, moonstruck, from Latin lūna moon]
 
lu'natically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

lunatic
late 13c., "affected with periodic insanity, dependent on the changes of the moon," from O.Fr. lunatique "insane," from L. lunaticus "moon-struck," from luna "moon" (see luna). Cf. O.E. monseoc "lunatic," lit. "moon-sick;" M.H.G. lune "humor, temper, mood, whim, fancy" (Ger.
Laune), from L. luna. Cf. also N.T. Gk. seleniazomai "be epileptic," from selene "moon." The noun meaning "lunatic person" is first recorded late 14c. Lunatic fringe (1913) was apparently coined by U.S. politician Theodore Roosevelt. Lunatic soup (1933) was Australian slang for "alcoholic drink."
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

lunatic

fringe n. [IBM] Customers who can be relied upon to accept release 1 versions of software. Compare heatseeker.
Easton
Bible Dictionary

Lunatic definition


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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Example sentences
It was occupied, but only by a poor lunatic gentleman, and the people who took care of him.
Obviously, none of these firms is in the lunatic fringe, so it is not the case that some applications should be ignored.
Our president isn't the only one who has had a totally lunatic pastor.
Today, many would dismiss such crudely racist views as belonging to a tiny
  right-wing lunatic fringe.
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