Synonyms|230Antonyms|32|Broader|3Narrower|0Related|172
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closable
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close-fitting
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closed to(expression, unaffected, unyielding, unbending, resistant)
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clouded
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cloudy
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cold
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confined(adjective, close, solid, short, substantial)
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confining(adjective, close, solid, short, substantial)
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congealed(hard, solid, rigid)
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cramped(adjective, solid, compact, tight, dense)
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cropped(adjective, close, solid, short, substantial)
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crystallizable
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dim
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enigmatic
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enigmatical
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fine-grained(hard, solid, rigid)
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fixed
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formal
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galeproof(adjective, watertight)
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grumous
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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>