Synonyms|119Antonyms|43|Broader|3Narrower|0Related|375

34 entries under adjective topic. ×

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heavy
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imperviable(watertight, enigmatical)
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incognizable(watertight, enigmatical)
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incomprehensible
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mysterious
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obscure
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opaque
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unfathomable
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ungraspable(watertight, enigmatical)
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unintelligible
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unknowable(clear, plain, watertight, enigmatical)
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unpiercable(watertight, enigmatical)
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unpierceable(watertight, enigmatical)
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unreceptive(affected, watertight, enigmatical)
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APASmart Define. (2015). penetrable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/penetrable/thesaurus/antonyms
ChicagoSmart Define. 2015. "penetrable thesaurus" https://smartdefine.org/penetrable/thesaurus/antonyms (accessed September 26, 2026).
HarvardSmart Define 2015, penetrable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/penetrable/thesaurus/antonyms>.
MLASmart Define. "penetrable thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/penetrable/thesaurus/antonyms>