50 entries under steady topic. ×

6
immutable(adjective, calm, strong, solid)
6
reliable(adjective, calm, strong, secure, tough)
6
stalwart(adjective, calm, strong, sound, secure)
6
tenacious(adjective, strong, sound, secure, tough)
6
unchangeable(adjective, calm, strong, secure, firm)
5
unchanging(adjective, set, firm, solid)
4
set(verb, adjective, calm, strong, secure)
3
immovable(adjective, strong, secure, firm, solid)
3
staunch(adjective, calm, strong, sound, secure)
3
well-founded(adjective, calm, strong, sound, secure)
2
secure(adjective, calm, strong, sound, tough)
2
set in stone(expression, adjective, idiom, calm, strong)
2
solid as a rock(expression, adjective, idiom, calm, strong)
2
sure(adjective, calm, strong, secure, firm)
2
unvarying(adjective, calm, strong, secure, firm)
1
anchored(calm, strong, secure, solid)
1
balanced(adjective, calm, strong, secure, firm)
1
brick-wall(adjective, calm, strong, secure, firm)
1
calm(adjective, strong, secure, firm, solid)
1
deep-rooted(adjective, calm, strong, solid)
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APASmart Define. (2015). durable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/durable/thesaurus/synonyms
ChicagoSmart Define. 2015. "durable thesaurus" https://smartdefine.org/durable/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, durable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/durable/thesaurus/synonyms>.
MLASmart Define. "durable thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/durable/thesaurus/synonyms>