motivated or characterized by an extreme, uncritical enthusiasm or zeal, as in religion or politics.

adjective

disinterested , dispassionate , impartial , unenthusiastic

adjective

biased , bigoted , bugged , burning * , contumacious , credulous , devoted , dogmatic , domineering , enthusiastic , erratic , extreme , fervent , feverish , fiery , frenzied , headstrong , high on , immoderate , impassioned , impulsive , incorrigible , infatuated , mad , monomaniacal , narrow-minded , nuts for , obsessed , obsessive , obstinate , opinionated , partial , partisan , passionate , possessed , prejudiced , rabid , radical , raving , single-minded , stubborn , turned on , unruly , violent , visionary , wild , willful , zealous , extremist , fanatic , revolutionary , ultra