5
vouchsafe
4
adjure(verb, show, confirm, prove, appear)
4
admit(verb, declare, acknowledge, confirm, affirm)
4
bear witness to(verb, expression, idiom, confirm, affirm)
4
connote(verb, mean, show, determine, direct)
4
give testimony(verb, expression, idiom, sign, confirm)
4
mark(noun, verb, make, give, mean)
4
point to(verb, expression, phrasal verb, state, give)
4
stand behind(expression, support, maintain, praise, secure)
4
take the stand(verb, expression, idiom, law, give)
4
tell(verb, state, maintain, reveal, acknowledge)
4
undersign
3
accept(verb, affirm)
3
accredit(verb, support, state, praise, favor)
3
affirmation
3
assent(evidence, affirmation)
3
assert under oath(expression, idiom, support, guarantee)
3
back up(verb, expression, support, praise, approve)
3
book
3
circumstantiate(verb, support, back, sign, uphold)
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APASmart Define. (2015). attest thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/attest/thesaurus/synonyms
ChicagoSmart Define. 2015. "attest thesaurus" https://smartdefine.org/attest/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, attest thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/attest/thesaurus/synonyms>.
MLASmart Define. "attest thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/attest/thesaurus/synonyms>