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