796 entries under adjective topic. ×

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effective(clear, sound, extraordinary, important)
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estimable(good, great, excellent, perfect)
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factual(correct, reasonable, sensible, exact)
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flinty
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frozen(hard, firm, stiff, tense)
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fundamental(simple, whole, united)
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gargantuan(big, heavy, substantial, large)
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hale(strong, sound, complete, tough)
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impermeable(close, set, hard, tough)
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impregnable(safe, unyielding, sheltered, protected)
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incontestable
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indisputable
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integrated(simple, whole, united, cohesive)
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invariable(calm, strong, smooth, severe)
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just(good, sound, correct, right)
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natural(material, substantial, tangible)
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noble(outstanding, worthy, notable, eminent)
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nourishing(enthusiastic, vigorous, sincere, wholehearted)
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objective(physical, material, substantial, real)
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old(familiar, established, traditional, long-established)
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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>