adjective

mutually opposed or inconsistent.

the two studies came to contradictory conclusions

opposed,in opposition,opposite,antithetical,contrary,contrasting,conflicting,at variance,at odds,opposing,clashing,divergent,discrepant,different,inconsistent,incompatible,irreconcilable,incongruous,paradoxical,backasswards,oppugnant,repugnant

noun

a contradictory proposition.