fanatic
adjective
1. marked by excessive enthusiasm for and intense devotion to a cause or idea
Similar word(s): passionate, fanatical, overzealous, rabid
noun
1. 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
Similar word(s): fiend
Definition categories: person, enthusiast, partisan, partizan