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2 entries under permeable topic. ×

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porose(adjective, unpermeable)
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spongelike(adjective, unpermeable)
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APASmart Define. (2011). inpenetrable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/inpenetrable/thesaurus/antonyms
ChicagoSmart Define. 2011. "inpenetrable thesaurus" https://smartdefine.org/inpenetrable/thesaurus/antonyms (accessed September 27, 2026).
HarvardSmart Define 2011, inpenetrable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/inpenetrable/thesaurus/antonyms>.
MLASmart Define. "inpenetrable thesaurus" 23 May 2011. Web. 27 September 2026. <https://smartdefine.org/inpenetrable/thesaurus/antonyms>