50 entries under calm topic. ×

1
sure(strong, solid, steady, substantial)
1
together(strong, solid, steady, substantial)
1
unalterable(strong, solid, steady, substantial)
1
unchangeable(strong, solid, steady, substantial)
1
unfluctuating(strong, solid, steady, substantial)
1
uniform(strong, solid, steady, substantial)
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unvarying(strong, solid, steady, substantial)
1
unwavering(strong, solid, steady, substantial)
1
well-built(strong, solid, steady, substantial)
1
well-founded(strong, solid, steady, substantial)
<123>
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APASmart Define. (2016). perdurable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/perdurable/thesaurus/synonyms
ChicagoSmart Define. 2016. "perdurable thesaurus" https://smartdefine.org/perdurable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, perdurable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/perdurable/thesaurus/synonyms>.
MLASmart Define. "perdurable thesaurus" 3 March 2016. Web. 25 September 2026. <https://smartdefine.org/perdurable/thesaurus/synonyms>