opposition

[1]	hostility , resistance , antagonism , unfriendliness , resistance , counteraction , disapproval , objection , conflict , defiance , contrast , antipathy , adversity , (Colloq) flak
[2]	competition , oppositeness , opponent , adversary , competitor , antagonist , enemy , foe , rival , other side
[3]	in opposition , confrontation , competing , competitive , antagonistic , hostile , conflicting , in conflict , antithetic(al) , opposed , at daggers drawn , in deadly embrace
[4]	opponent , opposite
[5]	enemy , foe , foeman