200 entries under solid topic. ×

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proved(good, strong, steady, consistent)
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reserved(adjective, reasonable, moderate, firm)
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right as rain(expression, idiom, complete, vigorous)
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serious-minded(adjective, firm, fixed, sturdy)
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sited(adjective, firm, stiff, inflexible)
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situate(adjective, firm, stiff, inflexible)
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strict(adjective, strong, flat, firm)
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there(good, strong, steady, consistent)
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thorough(complete, vigorous, sturdy)
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total(complete, vigorous, sturdy)
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true-hearted(good, strong, steady, consistent)
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undoubted(adjective, physical, material, true)
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unequivocal(good, strong, steady, consistent)
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unimpeachable(strong, steady, consistent, steadfast)
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uninjured(complete, vigorous, sturdy)
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unquestioning(adjective, firm, fixed, resolute)
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veracious(good, strong, steady, consistent)
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vibrant(complete, vigorous, sturdy)
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wholehearted(adjective, firm, fixed, resolute)
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wrapped tight(expression, complete, vigorous, sturdy)
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APASmart Define. (2015). stable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/stable/thesaurus/synonyms
ChicagoSmart Define. 2015. "stable thesaurus" https://smartdefine.org/stable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, stable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/stable/thesaurus/synonyms>.
MLASmart Define. "stable thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/stable/thesaurus/synonyms>