118 entries under solid topic. ×

1
ardent(adjective, close, correct, warm, firm)
1
athletic(adjective, strong, sound, tough, fit)
1
balanced(adjective, calm, strong, secure, firm)
1
big(adjective, strong, sound, tough)
1
brick-wall(adjective, calm, strong, secure, firm)
1
calm(adjective, quiet, strong, cool, secure)
1
capable(adjective, calm, quiet, strong, sound)
1
certain(adjective, set, clear, complete, firm)
1
cool(noun, adjective, calm, quiet, strength)
1
dead set on(expression, idiom, strong, firm)
1
dedicated(adjective, complete, warm, firm, total)
1
energetic(adjective, strong, sound, tough)
1
equable(adjective, calm, strong, secure, firm)
1
even(adjective, calm, strong, secure, firm)
1
fixed resistant(expression, calm, strong, substantial)
1
forceful(adjective, strong, sound, tough)
1
forcible(adjective, strong, sound, tough)
1
hale(adjective, strong, sound, tough, fit)
1
hard as nails(expression, adjective, idiom, strong, sound)
1
healthy(adjective, strong, sound, tough, fit)
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APASmart Define. (2016). enduring thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/enduring/thesaurus/synonyms
ChicagoSmart Define. 2016. "enduring thesaurus" https://smartdefine.org/enduring/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, enduring thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/enduring/thesaurus/synonyms>.
MLASmart Define. "enduring thesaurus" 29 March 2016. Web. 20 September 2026. <https://smartdefine.org/enduring/thesaurus/synonyms>