66 entries under firm topic. ×

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fixed(adjective, solid, stable, sturdy)
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immovable(adjective, solid, stable, fixed)
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imperturbable(adjective, sensible, solid, steady)
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intense(adjective, sensible, solid, steady)
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levelheaded(adjective, sensible, solid, steady)
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liege(adjective, sensible, solid, steady)
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loyal(adjective, sensible, solid, steady)
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never-failing(adjective, solid, stable, fixed)
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patterned(adjective, solid, stable, fixed)
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poised(adjective, sensible, solid, steady)
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regular(adjective, solid, stable, fixed)
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reliable(adjective, sensible, solid, steady)
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reserved(adjective, sensible, solid, steady)
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resolute(adjective, sensible, solid, steady)
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safe(adjective, solid, stable, fixed)
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secure(adjective, solid, stable, fixed)
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self-possessed(adjective, sensible, solid, steady)
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sensible(adjective, solid, steady, stable)
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serene(adjective, sensible, solid, steady)
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set(adjective, solid, stable, thoughtful)
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APASmart Define. (2015). serious-minded thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/serious-minded/thesaurus/synonyms
ChicagoSmart Define. 2015. "serious-minded thesaurus" https://smartdefine.org/serious-minded/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, serious-minded thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/serious-minded/thesaurus/synonyms>.
MLASmart Define. "serious-minded thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/serious-minded/thesaurus/synonyms>