6
thick(adjective, close, set, strong, hard)
6
well-founded(adjective, calm, good, strong, sound)
6
worthwhile(adjective, good, big, important, significant)
5
absolute(physical, material, certain, real, genuine)
5
adequate(adjective, great, reasonable, full, abundant)
5
bountiful(adjective, give, great, big, rich)
5
burly(adjective, strong, hard, fit, solid)
5
capacious(adjective, great, big, generous, sufficient)
5
close(adjective, set, strong, hard, tough)
5
cogent(sound, reasonable, rational)
5
compact(adjective, close, set, strong, hard)
5
cordial(adjective, enthusiastic, vigorous, sincere, wholehearted)
5
corporal(adjective, physical, material, human, actual)
5
effectual(adjective, complete, solid, vigorous, sturdy)
5
fundamental(adjective, important)
5
gigantic(adjective, great, big, huge)
5
husky(adjective, strong, hard, great, solid)
5
immense(adjective, great, big, awkward, huge)
5
liberal(adjective, great, big, generous, abundant)
5
meaty(adjective, significant)
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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>