noun
zeal, zealotry, extremism, militancy, dogmatism, bigotry, intolerance, obsession, prejudice, superstition, narrow-mindedness, monomania, injustice, obstinacy, stubbornness, bias, unreasonableness, unreasoning zeal, excessive enthusiasm, overenthusiasm, overzealousness, partiality, devotion, warmth, fervor, ardor, partisanship, violence, immoderation, radicalism, ultraism, wild and extravagant notions, singlemindedness, infatuation, dogma, arbitrariness, tenacity, enthusiasm, abandonment, frenzy, passion.
Antonyms moderation, tolerance, indifference*.