fa·nat·ic
fə-ˈna-tik
plural fanatics
1
disapproving
: a person exhibiting excessive enthusiasm and intense uncritical devotion toward some controversial matter (as in religion or politics)
a religious fanatic [=extremist]
The fanatics are convinced they are serving a righteous cause and that all means are justified …—Flora Lewis
2
: a person who is extremely enthusiastic about and devoted to some interest or activity
a boating/sports/racing fanatic
She's a real fanatic when it comes to working out.
Since the U.S. economy began to sputter in 2008, shoppers have become coupon fanatics and lovers of buy-one-get-one-free deals …—Janet K. Keeler
variants
or fanatical
: marked by excessive enthusiasm and often intense uncritical devotion
they're fanatic about politics
a fanatic attention to details
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Merriam-Webster unabridged
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