fanatic

Noun
  1. A person motivated by irrational enthusiasm (as for a cause) (synset 110097659)
    "A fanatic is one who can't change his mind and won't change the subject"
    is a type of: enthusiast, partisan, partizan - an ardent and enthusiastic supporter of some person or activity
    same as: fiend
Adjective
  1. Marked by excessive enthusiasm for and intense devotion to a cause or idea (synset 301731073)
    "rabid isolationist"
    similar to: passionate - having or expressing strong emotions
    same as: fanatical, overzealous, rabid

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