1) Ardent 2) Avid 3) Besotted 4) Bigoted 5) Compulsive 6) Devoted 7) Eager 8) Enthusiastic 9) Extreme 10) Fanatic 11) Fervent 12) Keen 13) Manic 14) Obsessed 15) Overzealous 16) Passionate 17) Rabid 18) Smitten 19) Wild 1) Fanatic 2) Fixated 3) Gripped 4) Infatuated 5) Overly enthusiastic 6) Overzealous 7) Passionate 8) Possessed 9) Preoccupied 10) Rabid 
• (a.) Characteristic of, or relating to, fanaticism; fanatic.
Fa·nat'ic·al adjective Characteristic of, or relating to, fanaticism; fanatic. - 
fanatical 1. Possessed with or motivated by excessive, irrational zeal. 2. Motivated or characterized by an extreme, uncritical enthusiasm or zeal; such as, in religion or politics.