contradictory -- (two propositions are contradictories if both cannot be true (or both cannot be false) at the same time)
Overview of adj contradictory
The adj contradictory has 4 senses
contradictory -- (of words or propositions so related that both cannot be true and both cannot be false; "`perfect' and `imperfect' are contradictory terms")
confounding, contradictory -- (that confounds or contradicts or confuses)
at odds, conflicting, contradictory, self-contradictory -- (in disagreement; "the figures are at odds with our findings"; "contradictory attributes of unjust justice and loving vindictiveness"- John Morley)
contradictory, mutually exclusive -- (unable to be both true at the same time)