See contravene in Webster's New World Roget's A-Z Thesaurus II
verb
To fail to fulfill (a promise) or conform to (a regulation):
breach, break, infringe, transgress, violate. See doTo refuse to admit the truth, reality, value, or worth of:
contradict, controvert, deny, disaffirm, gainsay, negate, negative, oppugn. (Law) traverse. See affirm
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