| Opponent 1. (n.) One who opposes; an adversary; an antagonist; a foe. 2. (a.) Situated in front; opposite; hence, opposing; adverse; antagonistic. 3. (n.) One who opposes in a disputation, argument, or other verbal controversy; specifically, one who attacks some theirs or proposition, in distinction from the respondent, or defendant, who maintains it. Thesaurus Entries 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 |