48
evidence(noun, verb, expression, feature, support)
43
firm(adjective, characteristic, strain, firmness, labour)
43
strong(adjective, strain, firmness, labour, hardiness)
39
hard(adjective, strain, firmness, labour, hardness)
38
stable(adjective, strain, firmness, labour, hardiness)
37
sound(adjective, calm, strain, restrained, short)
36
stiff(adjective, strain, firmness, labour, hardness)
27
resistant(adjective, strain, resist, firmness, labour)
25
trial(noun, expression, action, study, understanding)
23
tight(adjective, strain, firmness, labour, hardiness)
20
substantiation(noun, support, check, information, mark)
20
immune(adjective, strain, resist, firmness, labour)
20
impregnable(adjective, strain, firmness, labour, hardiness)
20
steadfast(adjective, characteristic, strain, firmness, labour)
19
steady(adjective, calm, strain, restrained, firmness)
18
fact(noun, measure, test, truth, standard)
18
demonstration(noun, appearance, information, mark, cause)
18
fast(adjective, strain, firmness, labour, hardiness)
18
resilient(adjective, strain, firmness, labour, hardiness)
18
resist(adjective, strain, firmness, labour, hardiness)
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APASmart Define. (2015). proof thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/proof/thesaurus/synonyms
ChicagoSmart Define. 2015. "proof thesaurus" https://smartdefine.org/proof/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, proof thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/proof/thesaurus/synonyms>.
MLASmart Define. "proof thesaurus" 22 December 2015. Web. 22 September 2026. <https://smartdefine.org/proof/thesaurus/synonyms>