1. (

• fanatic ,
• fiend ,

) 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";

1. (

• fanatic ,
• fanatical ,
• overzealous ,
• rabid

) marked by excessive enthusiasm for and intense devotion to a cause or idea; "rabid isolationist" ;