202 entries under solid topic. ×

5
husky(adjective, strong, hard, great)
5
staunch(adjective, calm, strong, sound, secure)
5
thickset(adjective, hard, heavy, deep)
5
unshakable(adjective, strong, hard, continue)
4
forceful(adjective, strong, sound, tough)
4
hale(adjective, strong, sound, complete, tough)
4
impenetrable(adjective, close, set, strong, hard)
4
impermeable(adjective, close, set, hard, tough)
4
nonporous(hard, rigid, density)
4
sober(adjective, firm, big, heavy)
4
tenacious(adjective, strong, sound, tough, fit)
3
able-bodied(adjective, strong, sound, tough, fit)
3
fixed(adjective, strong, hard, sound, tough)
3
heavy-duty(adjective, strong, great, sound, tough)
3
resolute(adjective, calm, strong, secure, firm)
3
set(adjective, calm, strong, hard, secure)
3
sincere(adjective, physical, material, enthusiastic)
3
strapping(adjective, strong, great, sound, tough)
3
well-constructed(complete, vigorous, sturdy)
2
able(adjective, strong, sound, tough, fit)
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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>