an insane person.
a person whose actions and manner are marked by extreme eccentricity or recklessness.
Law. a person legally declared to be of unsound mind and who therefore is not held capable or responsible before the law.
adjective Also, lunatical [loo-nat-i-kuhl] , (for defs 4, 5, 7).
insane; demented; crazy.
characteristic or suggestive of lunacy; wildly or recklessly foolish.
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.

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

lunatically, adverb
half-lunatic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lunatic (ˈluːnətɪk)
1.  an archaic word for insane
2.  foolish; eccentric; crazy
3.  a person who is insane
[C13 (adj) via Old French from Late Latin lūnāticus crazy, moonstruck, from Latin lūna moon]

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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Word Origin & History

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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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
Fortunately, the power of the lunatic fringe remained considerably smaller than
  its grandstanding.
And you talk with him for a while and feel safe because he's not a lunatic.
The lunatic fringe group throws their weight around quite a bit, and
  desperately wants to portray themselves as the majority.
At the time, proponents of global warming were generally considered the lunatic
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