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Synonyms for attest
verb
To assure the certainty or validity of:
authenticate, back (up), bear out, confirm, corroborate, evidence, justify, substantiate, testify (to), validate, verify, warrant. See support, trueTo confirm formally as true, accurate, or genuine:
certify, testify, vouch (for), witness. Idiom: bear witness to. See affirmTo give grounds for believing in the existence or presence of:
argue, bespeak, betoken, indicate, mark, point to, testify, witness. See showTo give evidence or testimony under oath:
swear, testify, witness. (Law) depone, depose. Idioms: bear witness, take the stand. See law
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