Synonyms|230Antonyms|32|Broader|3Narrower|0Related|172
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hardened(hard, solid, rigid)
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harsh
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hazy
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hermetically sealed
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hidden
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immune(unaffected, unyielding, unbending, resistant, unreceptive)
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impregnable(adjective, waterproof)
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impure
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incognizable
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indiscernible
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inelastic(hard, solid, rigid)
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inexplicable
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inflexible(hard, solid, rigid)
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inscrutable
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invious
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invulnerable(unaffected, unyielding, unbending, resistant, unreceptive)
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jelled(hard, solid, rigid)
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knotted
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knotty
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lumpish
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APASmart Define. (2015). impermeable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/impermeable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impermeable thesaurus" https://smartdefine.org/impermeable/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, impermeable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/impermeable/thesaurus/synonyms>.
MLASmart Define. "impermeable thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/impermeable/thesaurus/synonyms>