118 entries under solid topic. ×

19
stabile(adjective, calm, strong, secure, strain)
18
fixed(adjective, strong, sound, tough, flat)
14
immutable(adjective, calm, strong, secure, firm)
11
unchanging(adjective, close, correct, firm, honest)
10
unwavering(adjective, calm, close, strong, secure)
9
changeless(adjective, firm, certain, stable)
9
unfaltering(adjective, complete, firm, total)
7
resolute(adjective, calm, close, strong, secure)
7
tenacious(adjective, strong, sound, tough, fit)
7
unchangeable(adjective, calm, strong, secure, flat)
7
unqualified(adjective, strong, complete, flat, firm)
6
unvarying(adjective, calm, strong, secure, firm)
5
hardy(adjective, strong, sound, tough, fit)
5
secure(adjective, calm, strong, sound, tough)
5
staunch(adjective, calm, close, strong, sound)
5
sturdy(adjective, calm, strong, sound, secure)
4
determined(adjective, strong, flat, warm, firm)
4
sure(adjective, calm, close, strong, complete)
4
unswerving(adjective, close, set, correct, firm)
3
deep-rooted(adjective, calm, strong, substantial)
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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>