adjectives
of words or propositions so related that both cannot be true and both cannot be false
"`perfect' and `imperfect' are contradictory terms"
is similar to
of words: having opposite meanings
that confounds or contradicts or confuses
in disagreement
"the figures are at odds with our findings"; "contradictory attributes of unjust justice and loving vindictiveness"- John Morley
unable to be both true at the same time