From The Collaborative International Dictionary of English v.0.44 [gcide]:
Antithetic \An'ti*thet"ic\, Antithetical \An'ti*thet"ic*al\, adjective [Gr. ?.] Pertaining to antithesis, or opposition of words and sentiments; containing, or of the nature of, antithesis; contrasted.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
72 Moby Thesaurus words for "antithetical": adversary, adversative, adverse, adversive, alien, antagonistic, anti, antipathetic, antipodal, antipodean, 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, eyeball-to-eyeball, facing, fractious, hostile, inconsistent, inimical, inverse, negative, noncooperative, obstinate, obverse, opponent, opposed, opposing, opposite, oppositional, oppositive, oppugnant, overthwart, perverse, polar, polaric, polarized, recalcitrant, refractory, repugnant, reverse, rival, squared off, uncooperative, unfavorable, unfriendly, unpropitious
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