65 entries under hard topic. ×

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impermeable(solid, rigid)
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nonporous(tough, solid, rigid, inflexible)
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sturdy(tough, solid, rigid, inflexible)
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substantial(solid, rigid)
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tough(solid, rigid, inflexible)
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APASmart Define. (2015). congealed thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/congealed/thesaurus/synonyms
ChicagoSmart Define. 2015. "congealed thesaurus" https://smartdefine.org/congealed/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, congealed thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/congealed/thesaurus/synonyms>.
MLASmart Define. "congealed thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/congealed/thesaurus/synonyms>