adversary adversative adverse alien antagonistic anti antipathetic antithetic clashing competing con conflicting contradictory contrary counter cross cutthroat disaccordant dissentient emulous enemy fractious hostile in competition in rivalry inimical negative noncooperative obstinate opponent opposed opposing opposite oppositional oppositive oppugnant overthwart perverse recalcitrant refractory repugnant rival rivaling uncooperative unfavorable unfriendly unpropitious vying