fanatic

US /fəˈnæt̬.ɪk/
UK /fəˈnæt̬.ɪk/
"fanatic" picture
1.

a person filled with excessive and single-minded zeal, especially for an extreme religious or political cause

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He was a religious fanatic who believed the end of the world was near.
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The political fanatics refused to compromise.
:
extremistradicalzealotbigotdogmatist
2.

a person with an obsessive interest in and enthusiasm for something

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He's a real football fanatic, he never misses a game.
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My sister is a fitness fanatic; she works out every day.
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enthusiastdevoteeaddictbufffiend
1.

filled with or expressing excessive zeal

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His fanatic devotion to the cause was admirable, yet concerning.
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She had a fanatic belief in her own abilities.
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zealousextremistradicalbigotedobsessive