Synonyms|119Antonyms|43|Broader|3Narrower|0Related|375
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grave
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gravid
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grievous
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hard
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heavy
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imperviable(adjective, watertight, enigmatical)
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impregnable
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incognizable(adjective, watertight, enigmatical)
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incomprehensible
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mysterious
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nonporous
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obscure
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opaque
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rainproof
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tight
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unfathomable
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ungraspable(adjective, watertight, enigmatical)
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unintelligible
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unknowable(adjective, clear, plain, watertight, enigmatical)
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unpiercable(adjective, watertight, enigmatical)
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APASmart Define. (2015). penetrable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/penetrable/thesaurus/antonyms
ChicagoSmart Define. 2015. "penetrable thesaurus" https://smartdefine.org/penetrable/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2015, penetrable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/penetrable/thesaurus/antonyms>.
MLASmart Define. "penetrable thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/penetrable/thesaurus/antonyms>