Synonyms of 'antithetical'

adversary, adversative, adverse, alien, antagonistic, anti, antipathetic, antipodal, antipodean, antithetic, antonymous, competitive, con, contradictory, contrapositive, contrarious, contrary, converse, counter, cross, discordant, discrepant, dissentient, enemy, facing, fractious, hostile, inconsistent, inimical, inverse, negative, obstinate, obverse, opponent, opposite, oppugnant, perverse, polar, recalcitrant, refractory, repugnant, reverse, rival, uncooperative, unfavorable, unfriendly, unpropitious