a person with an extreme and uncritical enthusiasm or zeal, as in religion or politics.

1515–25; < Latin fānāticus pertaining to a temple, inspired by orgiastic rites, frantic, equivalent to fān(um) temple + -āticus, equivalent to -āt(us) -ate1 + -icus -ic

nonfanatic, noun, adjective

1. fanatic, frantic, frenetic (see synonym study at the current entry) ; 2. fanatic, phonetic.

1. enthusiast, zealot, bigot, hothead, militant. Fanatic, zealot, militant, devotee refer to persons showing more than ordinary support for, adherence to, or interest in a cause, point of view, or activity. Fanatic and zealot both suggest excessive or overweening devotion to a cause or belief. Fanatic further implies unbalanced or obsessive behavior: a wild-eyed fanatic. Zealot only slightly less unfavorable in implication than fanatic implies single-minded partisanship: a tireless zealot for tax reform. Militant stresses vigorous, aggressive support for or opposition to a plan or ideal and suggests a combative stance. Devotee is a milder term than any of the foregoing, suggesting enthusiasm but not to the exclusion of other interests or possible points of view: a jazz devotee. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fanatic (fəˈnætɪk)
1.  a person whose enthusiasm or zeal for something is extreme or beyond normal limits
2.  informal a person devoted to a particular hobby or pastime; fan: a jazz fanatic
3.  a variant of fanatical
[C16: from Latin fānāticus belonging to a temple, hence, inspired by a god, frenzied, from fānum temple]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1520s, "insane person," from L. fanaticus "mad, enthusiastic, inspired by a god," originally, "pertaining to a temple," from fanum "temple," related to festus "festive" (see feast). Current sense of "extremely zealous," especially in religion, is first attested 1640s. The
noun is from mid-17c., originally in religious sense, of Nonconformists.
"A fanatic is someone who can't change his mind and won't change the subject." [Winston Churchill]
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Turning a haircut into a matter of grave moral significance is the work of a
With six billion people in the world, there's no predicting what some cunning
  fanatic or narcissistic despot might do.
Yet another fanatic who thinks if he says a lie with enough emphasis it
  suddenly becomes the truth.
Regardless, it is your paranoid ranting that clearly paints you as an
  anti-science fanatic.
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