4
clinch(verb, settle, guarantee)
4
consent(verb, approve, authorize, sanction, endorse)
4
legalize(verb, endorse, prove, verify, substantiate)
4
license(verb, state, approve, confirm, authorize)
4
manifest(verb, show, determine, confirm, verify)
4
resolve
4
underwrite(verb, support, praise, favor, back)
3
agree(verb, authorize, verify, substantiate, validate)
3
bless(verb, support, praise, favor, back)
3
circumstantiate(verb, support, determine, back, sign)
3
commission(verb, state, approve, confirm, authorize)
3
declare(verb, state, show, determine, confirm)
3
evince(verb, evince)
3
exhibit(verb, show, confirm, prove, appear)
3
give the go-ahead(expression, idiom, support, praise, favor)
3
make good(verb, expression, idiom, support, back)
3
record(verb, detail)
3
sign(verb, support, back, approve, sanction)
3
state(verb, confirm, appear, verify, swear)
3
strengthen(verb, confirm, story, verify, substantiate)
11 years ago|8.9k views|share |citing 
APASmart Define. (2015). authenticate thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/authenticate/thesaurus/synonyms
ChicagoSmart Define. 2015. "authenticate thesaurus" https://smartdefine.org/authenticate/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, authenticate thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/authenticate/thesaurus/synonyms>.
MLASmart Define. "authenticate thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/authenticate/thesaurus/synonyms>