When Something Contradicts Itself

What is the word for a phrase that contradicts itself?

An oxymoron is a self-contradicting word or group of words (as in Shakespeare’s line from Romeo and Juliet, “Why, then, O brawling love! O loving hate!”). A paradox is a statement or argument that seems to be contradictory or to go against common sense, but that is yet perhaps still true—for example, “less is more.”

What is it called when two things contradict?

Some common synonyms of contradictory are antithetical, contrary, and opposite. While all these words mean “being so far apart as to be or seem irreconcilable,” contradictory applies to two things that completely negate each other so that if one is true or valid the other must be untrue or invalid.