Synonyms of fanatical in English:

fanatical


See US English definition of fanatical

See UK English definition of fanatical

See Spanish definition of fanático

adjective

1‘they are fanatical about their faith’

SYNONYMS
zealous, extremist, extreme, militant, dogmatic, sectarian, bigoted, rabid, maniacal, radical, diehard, activist
prejudiced, chauvinistic, intolerant, narrow-minded, single-minded, partisan, blinkered, illiberal, inflexible, uncompromising
British informal swivel-eyed
ANTONYMS

moderate, open-minded

2‘the band gained a fanatical following’

SYNONYMS
enthusiastic, eager, keen, fervent, ardent, fervid, passionate, devoted, dedicated
over-enthusiastic, obsessive, obsessed, infatuated, fixated, compulsive, immoderate, frenzied, frenetic
informal wild, gung-ho, nuts, crazy, hooked
British informal potty, dotty
US informal wackadoo, wackadoodle
literary passional, perfervid
ANTONYMS

indifferent