81 entries under fixed topic. ×

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regular(adjective, firm, solid, substantial, stable)
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reserved(adjective, firm, solid, stable)
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sedate(adjective, firm, solid, stable)
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self-possessed(adjective, firm, solid, stable)
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sensible(adjective, firm, solid, stable)
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serene(adjective, firm, solid, stable)
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serious-minded(adjective, firm, solid, stable)
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single-minded(adjective, firm, solid, stable)
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sober(adjective, firm, solid, stable)
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staid(adjective, firm, solid, stable)
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steady-going(adjective, firm, solid, substantial, stable)
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stuck(firm, true, constant, steadfast)
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true(firm, constant, steadfast, immovable)
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true blue(expression, firm, true, constant)
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unfaltering(adjective, firm, solid, stable)
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unqualified(adjective, firm, solid, stable)
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unquestioning(adjective, firm, solid, stable)
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unshaken(adjective, firm, solid, stable)
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unswerving(adjective, firm, solid, stable)
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wedged(firm, true, constant, steadfast)
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APASmart Define. (2015). durable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/durable/thesaurus/synonyms
ChicagoSmart Define. 2015. "durable thesaurus" https://smartdefine.org/durable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, durable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/durable/thesaurus/synonyms>.
MLASmart Define. "durable thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/durable/thesaurus/synonyms>