motivated or characterized by an extreme, uncritical enthusiasm or zeal, as in religion or politics.
Also, fanatic.

1540–50; fanatic + -al1

fanatically, adverb
fanaticalness, noun
nonfanatical, adjective
nonfanatically, adverb
unfanatical, adjective
unfanatically, adverb

enthusiastic, zealous, frenzied, rabid. See intolerant, radical. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fanatical (fəˈnætɪkəl)
surpassing what is normal or accepted in enthusiasm for or belief in something; excessively or unusually dedicated or devoted

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

1540s, from fanatic + -al (1). Related: Fanatically.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Opera stars have their claques, fanatical followers and sometimes even
  completely demented stalkers.
But over the past few decades it has attracted fanatical thugs to its ranks.
Pound thundered out social and political views which later he would shun as
  wrong and fanatical.
He is sensibly trying to draw the less fanatical into negotiation while
  promising to hammer the rest.
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