575 entries under adjective topic. ×

83
strong(calm, good, strong, hard)
61
firm(noun, calm, close, strong)
59
sound(noun, calm, strong, hard)
58
persistent(strain, firmness, labour, hardiness)
57
stable(strong, hard, sound, complete)
49
solid(calm, good, close, strong)
47
stout(calm, strong, sound, secure)
44
hard(tough, strain, difficult, solid)
40
stiff(strain, firmness, labour, hardiness)
40
significant(strong, importance, big, heavy)
38
consistent(strain, firmness, labour, hardiness)
38
unfluctuating(calm, strong, secure, strain)
36
considerable(great, reasonable, fair, importance)
35
big(strong, great, sound, tough)
34
durable(calm, strong, sound, secure)
33
material(noun, body, hard, solid)
29
abundant(give, great, strain, big)
28
ample(give, great, reasonable, fair)
27
steady(calm, strong, sound, secure)
26
large(great, fair, big, important)
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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>