Synonyms|152Antonyms|5|Broader|1Narrower|0Related|55
2
assent(verb, support, take, agree, evidence)
2
assure
2
cosign(verb, support, take, agree, sign)
2
countersign(sign, rubber-stamp)
2
notarize(verb, sign, underwrite, subscribe, authenticate)
2
ratify
2
sanction(take, agree, underwrite)
2
say amen to(verb, expression, idiom, sign, underwrite)
2
set one's hand to(verb, idiom, law, sign, affix)
2
sign and seal(expression, idiom, evidence)
2
validate
1
accept
1
accredit
1
acquiesce(verb, support, take, agree, underwrite)
1
amen
1
authorise
1
be sponsor for(expression, idiom)
1
bond
1
countersecure
1
depose
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APASmart Define. (2015). undersign thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/undersign/thesaurus/synonyms
ChicagoSmart Define. 2015. "undersign thesaurus" https://smartdefine.org/undersign/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, undersign thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/undersign/thesaurus/synonyms>.
MLASmart Define. "undersign thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/undersign/thesaurus/synonyms>