119 entries under solid topic. ×

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ardent(adjective, firm, sensible, steady)
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brick-wall(adjective, firm, stable, fixed)
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collected(adjective, certain, sober, serious)
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equable(adjective, firm, sensible, steady)
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hopeful(adjective, strong, easy, certain)
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imperturbable(adjective, firm, sensible, certain)
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levelheaded(adjective, firm, sensible, steady)
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liege(adjective, firm, sensible, steady)
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patterned(adjective, firm, stable, fixed)
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reserved(adjective, firm, sensible, steady)
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safe(adjective, strong, secure, firm)
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self-possessed(adjective, firm, sensible, certain)
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serene(adjective, firm, sensible, steady)
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serious-minded(adjective, firm, sensible, steady)
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steady-going(adjective, firm, stable, fixed)
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sturdy(adjective, strong, firm, substantial)
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uniform(adjective, firm, stable, fixed)
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unquestioning(adjective, firm, stable, fixed)
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wholehearted(adjective, firm, sensible, steady)
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APASmart Define. (2016). settled thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/settled/thesaurus/synonyms
ChicagoSmart Define. 2016. "settled thesaurus" https://smartdefine.org/settled/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, settled thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/settled/thesaurus/synonyms>.
MLASmart Define. "settled thesaurus" 27 March 2016. Web. 21 September 2026. <https://smartdefine.org/settled/thesaurus/synonyms>