fanatic
adjective
- 1
marked by excessive enthusiasm for and intense devotion to a cause or idea
rabid isolationist
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"--Winston Churchill
Synonyms
Also useful for “fanatic”:Unscrambler— Rearrange the letters in “fanatic”