agreement to disagree, antagonism, antipathy, antithesis, bad blood, clashing, collision, competition, conflict, confrontation, contradiction, contradistinction, contraindication, contraposition, contrariety, contrariness, contrast, counterposition, difference, difference of opinion, difficulty, disaccord, disagreement, discrepancy, disparity, dissension, dividedness, division, enmity, fractiousness, friction, hostility, inconsistency, inimicalness, misunderstanding, negativeness, noncooperation, obstinacy, odds, oppositeness, opposition, opposure, oppugnance, oppugnancy, perverseness, perversity, polarity, polarization, recalcitrance, refractoriness, repugnance, rivalry, showdown, uncooperativeness, variance, vying