94 entries under vigorous topic. ×

83
strong(adjective, calm, good, strong, hard)
61
firm(noun, adjective, calm, close, strong)
59
sound(noun, adjective, calm, strong, hard)
57
stable(adjective, strong, hard, sound, complete)
49
solid(adjective, calm, good, close, strong)
28
ample(adjective, give, great, reasonable, fair)
23
robust(adjective, strong, sound, complete, tough)
22
sturdy(adjective, calm, strong, hard, sound)
19
real(adjective, solid, physical, material, enthusiastic)
17
generous(adjective, good, give, great, fair)
16
good(adjective, great, sound, right, reasonable)
16
hearty(adjective, strong, sound, complete, tough)
14
sizable(adjective, great, reasonable, fair, big)
10
true(adjective, good, sound, right, reasonable)
9
earnest(adjective, importance, big, heavy, enthusiastic)
8
genuine(adjective, good, sound, right, reasonable)
8
healthy(adjective, strong, complete, tough, fit)
8
square(adjective, enthusiastic, sincere, wholehearted)
8
well(adjective, strong, complete, tough, easy)
6
full(adjective, great, big, heavy, enthusiastic)
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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>