10
well-built(adjective, calm, strong, sound, secure)
9
bigwig(adjective, importance, valuable, main, notable)
9
earnest(adjective, importance, big, heavy, enthusiastic)
9
fateful(adjective, importance, valuable, main, notable)
9
objective(adjective, body, solid, physical, material)
9
plentiful(adjective, give, great, big, important)
9
relevant(adjective, importance, big, significant, large)
9
significative(adjective, importance, valuable, main, notable)
9
visible(adjective, material, significant, definite, real)
9
voluminous(adjective, give, great, big, heavy)
8
dependable(adjective, strong, tough, firm, solid)
8
enormous(adjective, great, big, awkward, huge)
8
genuine(adjective, good, sound, right, reasonable)
8
healthy(adjective, strong, complete, tough, fit)
8
lusty(adjective, strong, fit, solid, determined)
8
major(adjective, good, great, reasonable, fair)
8
notable(adjective, importance, main, extremely significant)
8
opulent(adjective, easy, rich, thriving, successful)
8
potent(adjective, good, strong, sound, right)
8
principal(adjective, big, important, significant, large)
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APASmart Define. (2016). substantial thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/substantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "substantial thesaurus" https://smartdefine.org/substantial/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, substantial thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/substantial/thesaurus/synonyms>.
MLASmart Define. "substantial thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/substantial/thesaurus/synonyms>