46 entries under solid topic. ×

1
unchangeable(calm, strong, steady, substantial)
1
unfluctuating(calm, strong, steady, substantial)
1
uniform(calm, strong, steady, substantial)
1
unvarying(calm, strong, steady, substantial)
1
unwavering(adjective, calm, strong, steady)
1
well-built(calm, strong, steady, substantial)
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APASmart Define. (2016). deep-rooted thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/deep-rooted/thesaurus/synonyms
ChicagoSmart Define. 2016. "deep-rooted thesaurus" https://smartdefine.org/deep-rooted/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, deep-rooted thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/deep-rooted/thesaurus/synonyms>.
MLASmart Define. "deep-rooted thesaurus" 26 February 2016. Web. 25 September 2026. <https://smartdefine.org/deep-rooted/thesaurus/synonyms>