fanatically

from WordNet (r) 3.0 (2006)

fanatically
    adv 1: in a passionately fanatic manner; "he followed the
           teachings of his guru fanatically"

from The Collaborative International Dictionary of English v.0.48

Fanatical \Fa*nat"ic*al\, a.
   Characteristic of, or relating to, fanaticism; fanatic.
   -{Fa*nat"ic*al*ly}, adv. -- {Fa*nat"ic*al*ness}, n.
   [1913 Webster]