Controvert
Part of speech: verb
Definition: To dispute or argue using reason. To be involved or engaged in controversy.
Contradict
Part of speech: verb
Definition: To speak against; to forbid.To deny the truth of (a statement or statements).To make a statement denying the truth of the statement(s) made by (a person).
Example sentence: Perhaps I abandoned criticism because I am full of contradictions, and when you write an essay, you are not supposed to contradict yourself. But in the theater, by inventing various characters, you can. My characters are contradictory not only in their language but in their behavior as well.