The Oxford Thesaurus An A-Z Dictionary of Synonyms - contradictv.

1) deny, gainsay, dispute, controvert, argue against; oppose: He is very opinionated, and doesn't like to be contradicted. 2) contravene, belie, refute, disallow, forbid, disaffirm, counter, abrogate, nullify, annul, reverse, counteract: The evidence yields nothing that contradicts my argument.