extremism (noun) fanaticism: overenthusiasm
Sinonime: benightedness, bewilderment, blindness, callowness, crudeness, darkness, denseness, disregard, dumbness, empty-headedness, fog*, half-knowledge, illiteracy, incapacity, incomprehension, innocence, inscience, insensitivity, lack of education, mental incapacity, naiveté, nescience, oblivion, obtuseness, philistinism, rawness, sciolism, shallowness, simplicity, unawareness, unconsciousness, uncouthness, unenlightenment, unfamiliarity, unscholarliness, vagueness
Antonime: disinterest, impartiality, unenthusiasm