796 entries under adjective topic. ×

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immobile(strong, secure, fixed, impassive)
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irreducible(simple, whole, united)
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irrefutable(sound, reasonable, material, certain)
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jam-packed(close, strong, short, substantial)
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jelled(set, hard, tough, firm)
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law-abiding(pure, real, genuine, reliable)
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permanent(calm, strong, secure, steady)
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persistent(strong, tough, firm, certain)
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resistant(strong, hard, tough, fit)
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same(simple, whole, united)
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satisfactory(good, clear, great, reasonable)
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self-colored
5
stationary(calm, strong, fixed, constant)
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stony(hard, firm, stiff, rigid)
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straight(open, direct, honest, modest)
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substantive(physical, material, substantial, actual)
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unalloyed(complete, continuous, closed, blocked)
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unbending(hard, firm, stiff, tense)
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unbreakable(strong, hard, tough, severe)
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unchangeable(calm, strong, secure, firm)
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APASmart Define. (2016). solid thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/solid/thesaurus/synonyms
ChicagoSmart Define. 2016. "solid thesaurus" https://smartdefine.org/solid/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, solid thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/solid/thesaurus/synonyms>.
MLASmart Define. "solid thesaurus" 29 March 2016. Web. 22 September 2026. <https://smartdefine.org/solid/thesaurus/synonyms>