Synonyms|673Antonyms|118|Broader|13Narrower|17Related|401

150 entries under confirm topic. ×

1
run it up a flagpole(expression, idiom, check, examine, try)
1
say so(verb, expression, support, maintain, back)
1
seal(verb, state, show, indicate)
1
see how it flies(expression, idiom, check, examine, try)
1
see how wind blows(expression, idiom, check, examine, try)
1
send up a balloon(expression, idiom, check, examine, try)
1
show cause(verb, expression, support, favor, sustain)
1
sign for(verb, expression, support, maintain, back)
1
size up(verb, expression, support, back)
1
speak in favor(verb, expression, idiom, support, favor)
1
sponsor(verb, support, maintain, back, declare)
1
square(verb, support, favor, sustain)
1
stack up(verb, expression, check, examine, try)
1
stand up(verb, expression, prove, demonstrate)
1
swear to(verb, expression, support, maintain, back)
1
swear up and down(verb, expression, idiom, support, maintain)
1
try on for size(expression, idiom, check, examine, try)
0
accredit(approve, sanction, endorse, validate)
0
adjure(show, prove, appear, swear)
0
announce(show, prove, appear, swear)
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APASmart Define. (2015). substantiate thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/substantiate/thesaurus/synonyms
ChicagoSmart Define. 2015. "substantiate thesaurus" https://smartdefine.org/substantiate/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, substantiate thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/substantiate/thesaurus/synonyms>.
MLASmart Define. "substantiate thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/substantiate/thesaurus/synonyms>