See contradict in Webster's New World Roget's A-Z Thesaurus II
verb
To refuse to admit the truth, reality, value, or worth of:
contravene, controvert, deny, disaffirm, gainsay, negate, negative, oppugn. (Law) traverse. See affirmTo fail to be in accord:
clash, conflict, disaccord, discord, jar. Idiom: go (or run) counter to. See agree
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