asserting the contrary or opposite; contradicting; inconsistent; logically opposite

contradictory statements.

tending or inclined to contradict.

Logic . a proposition so related to a second that it is impossible for both to be true or both to be false.

adjective

agreeing , confirming , consistent , reconcilable , reconciled , vouching

adjective

adverse , against , agin , anti , antipodal , antipodean , antithetic , antithetical , con , conflicting , contrary , converse , counter , counteractive , diametric , discrepant , incompatible , incongruous , inconsistent , irreconcilable , negating , no go , nullifying , opposing , opposite , ornery * , paradoxical , polar , repugnant , reverse , antonymic , antonymous , diametrical , antagonistic , contradicting

noun

antipode , antipodes , antithesis , antonym , contrary , converse , counter , reverse