Synonyms of antagonistic

2 Syllables
scrappier, naysaying, counter, coner, scrappy, maligns, flip-side, malign
3 Syllables
pugnacious, battleful, malefic, contentious, hostile, truculent, viperish, averse, opposing, unfriendly, conflicting, venomous, vitriolic, dissentient, repugnant, flipside, uneager, contrariant, vengeful, contrarious, contrarient, discordant, maligning
4 Syllables
unalike, negative, bellicose, unmusical, belligerent, combative, inharmonic, unsociable, disaffected, privative, restrictive, adversarial, maleficent, unsimilar, inimical, unpropitious, unneighborly, uninclined, violative, unharmonious, opposite
5 Syllables
unfavorable, oppositional, competitive, prohibitory, antipathetic, unconformable, adversative, unsubmissive, confrontational
6 Syllables
unaffirmative