575 entries under adjective topic. ×

11
comfortable(calm, quiet, light, smooth)
11
constitutive(importance, valuable, main, notable)
11
grave(importance, valuable, main, notable)
11
huge(great, big, heavy, important)
11
tough(calm, strong, hard, solid)
11
valuable(great, big, important, significant)
10
appreciable(reasonable, significant, large, adequate)
10
big-league(importance, valuable, main, notable)
10
bodily(physical, material, human, actual)
10
heavy(give, strong, hard, great)
10
historic(importance, important, main, extremely significant)
10
outstanding(importance, valuable, main, notable)
10
palpable(physical, material, significant, considerable)
10
portentous(importance, valuable, main, notable)
10
responsible(importance, valuable, main, notable)
10
satisfying(good, great, full, useful)
10
sensible(good, body, reasonable, firm)
10
true(good, sound, right, reasonable)
10
vast(great, big, important, significant)
10
well-built(calm, strong, sound, secure)
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APASmart Define. (2016). substantial thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/substantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "substantial thesaurus" https://smartdefine.org/substantial/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, substantial thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/substantial/thesaurus/synonyms>.
MLASmart Define. "substantial thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/substantial/thesaurus/synonyms>