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

Origin of fanatical

First recorded in 1540–50; fanatic + -al1
Related formsfa·nat·i·cal·ly, adverbfa·nat·i·cal·ness, nounnon·fa·nat·i·cal, adjectivenon·fa·nat·i·cal·ly, adverbun·fa·nat·i·cal, adjectiveun·fa·nat·i·cal·ly, adverb

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for fanatical


  1. surpassing what is normal or accepted in enthusiasm for or belief in something; excessively or unusually dedicated or devoted
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Derived Formsfanatically, adverb
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

Word Origin and History for fanatical


1540s, from fanatic + -al (1). Related: Fanatically.

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Online Etymology Dictionary, © 2010 Douglas Harper