45 entries under calm topic. ×

6
stalwart(adjective, strong, sound, secure)
6
unchangeable(adjective, strong, secure, firm)
4
set(verb, adjective, strong, secure)
3
staunch(adjective, strong, sound, secure)
3
well-founded(adjective, strong, sound, secure)
2
secure(adjective, strong, sound, tough)
2
set in stone(expression, adjective, idiom, strong)
2
solid as a rock(expression, adjective, idiom, strong)
2
sure(adjective, strong, secure, firm)
2
unvarying(adjective, strong, secure, firm)
1
anchored(strong, secure, solid, steady)
1
balanced(adjective, strong, secure, firm)
1
brick-wall(adjective, strong, secure, firm)
1
deep-rooted(adjective, strong, solid, steady)
1
equable(adjective, strong, secure, firm)
1
even(adjective, strong, secure, firm)
1
fixed resistant(expression, strong, solid, substantial)
1
nailed(strong, secure, solid, steady)
1
poised(adjective, strong, secure, firm)
1
resolute(adjective, strong, secure, firm)
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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>