fanatic

Noun	1.	fanatic - a person motivated by irrational enthusiasm (as for a cause); "A fanatic is one who can't change his mind and won't change the subject"--Winston Churchill fiend enthusiast, partizan, partisan - an ardent and enthusiastic supporter of some person or activity
Adj.	1.	fanatic - marked by excessive enthusiasm for and intense devotion to a cause or idea; "rabid isolationist" fanatical, overzealous, rabid passionate - having or expressing strong emotions

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