(n.) A prefix meaning against, opposite or opposed to, contrary, or in place of; -- used in composition in many English words. It is often shortened to ant-; as, antacid, antarctic.
Thesaurus Entries
adversary, adversative, adverse, adversive, alien, antagonistic, antipathetic, antithetic, antonymous, at cross-purposes, balancing, clashing, compensating, competitive, con, conflicting, confronting, contradictory, contradistinct, contrapositive, contrarious, contrary, contrasted, converse, counter, counterbalancing, counterpoised, countervailing, cross, dead against, disaccordant, discordant, discrepant, dissentient, enemy, eyeball to eyeball, fractious, hostile, inconsistent, inimical, inverse, negative, noncooperative, obstinate, obverse, opponent, opposed, opposing, opposite, oppositional, oppositive, oppugnant, overthwart, perverse, recalcitrant, refractory, repugnant, reverse, rival, squared off, uncooperative, unfavorable, unfriendly, unpropitious
