acrid, adversary, adverse, ajar, alien, antagonism, antagonistic, anti, antipathetic, antipathy, antithesis, antithetical, at cross-purposes, at odds, at variance, at war, backlash, bad blood, balancing, belligerence, belligerent, bitter, breakaway, caustic, clash, collision, compensating, competition, competitive, con, conflict, conflicting, confrontation, confronting, confused, contention, contradiction, contradictory, contradistinction, contraindication, contraposition, contrariety, contrary, contrast, controversy, converse, counter, cranky, cross, cross-purposes, crotchety, deity, despiteful, difference, differing, disaccord, disaccordant, disaffinity, disagreeable, disagreeing, disagreement, discord, discordant, discrepancy, discrepant, disharmonious, disharmony, disparity, disproportionate, dissension, dissent, dissidence, dissident, dissonance, dissonant, disunion, divergence, divergent, diversity, enemy, enmity, eyeball to eyeball, faction, fractious, friction, god, goddess, grating, harsh, hate, hateful, hatred, hostile, hostility, inaccordant, incompatibility, incompatible, incongruous, inconsistency, inconsistent, inequality, inharmonious, inimical, interference, inverse, jangle, jangling, jar, jarring, kick, malevolence, malevolent, malice, malicious, malignant, mischief, mixed, negation, negative, nonconformist, nonconformity, noncooperative, obstinacy, obstinate, obverse, odds, off-color, opponent, opposed, opposing, opposite, opposition, oppositional, out of whack, perverse, perversity, polarity, quarrelsome, rancorous, reaction, reactionary, recalcitrance, recalcitrant, recoil, refractory, renitency, renitent, repercussion, repugnance, repugnant, resistance, resistant, reverse, revolt, revolutionary, rival, rivalry, rub, showdown, sore, spite, spiteful, tension, uncongenial, uncooperative, unfavorable, unfriendly, unpleasantness, unpropitious, variance, variant, venomous, virulent, vitriolic, vying, warring