Synonyms and Antonyms of authenticate
1 to declare (something) to be true or genuine <a jeweler authenticated the diamond as real> Synonyms attest, certify, avouch, testify (to), vouch (for), witnessRelated Words guarantee, warrant; affirm, assert, aver, avow, profess, vow
2 to give evidence or testimony to the truth or factualness of <we require more than simply your word to authenticate this story> Synonyms argue, attest, confirm, bear out, certify, corroborate, substantiate, support, validate, verify, vindicateRelated Words avouch, back (up), testify (to), vouch (for), witness; guarantee, warrant; affirm, assert, aver, avow, declare, profess; demonstrate, document, establish, prove, reinforce (also reenforce)Near Antonyms contradict, gainsay; deny, disavow, disclaim; challenge, contest, dispute, questionAntonyms disprove, rebut, refute
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