List of opponent synonyms and opponent related words.
adversary, adversative, adverse, alien, antagonist, antagonistic, anti, antipathetic, antithetic, assailant, clashing, combatant, competitive, competitor, con, conflicting, contender, contestant, contradictory, contrary, counter, counteragent, cross, disaccordant, disputant, dissentient, enemy, foe, fractious, hostile, inimical, match, negative, noncooperative, obstinate, opposed, opposer, opposing, opposite, oppositional, oppositive, oppugnant, overthwart, perverse, recalcitrant, refractory, repugnant, rival, the opposition, uncooperative, unfavorable, unfriendly, unpropitious