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    impermeable
    /ɪmˈpəːmɪəbl/

    adjective

    • 1. not allowing fluid to pass through: "an impermeable membrane"

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  3. not allowing liquid or gas to go through: an impermeable membrane. Synonyms. impenetrable. impervious (SUBSTANCE) specialized. Compare. waterproof adjective. watertight (NO WATER) weatherproof adjective. Opposite. permeable formal. SMART Vocabulary: related words and phrases. Physics: the state of matter. absorbency. acidic. allotropic.

  4. : not permitting passage (as of a fluid) through its substance. broadly : impervious. impermeability. (ˌ)im-ˌpər-mē-ə-ˈbi-lə-tē. noun. Synonyms. impassable. impassible. impenetrable. impervious. impregnable. See all Synonyms & Antonyms in Thesaurus. Examples of impermeable in a Sentence. an impermeable layer of rock a fabric impermeable to moisture

  5. impermeable. / ĭm-pûr ′ mē-ə-bəl /. Relating to a material through which substances, such as liquids or gases, cannot pass. Some substances, such as some types of contact lenses, are permeable to gas but impermeable to liquid.

  6. Something that is impermeable does not allow water or liquid to pass through it. Made up of the prefix im-, meaning “not,” and the adjective permeable, meaning “allowing to pass through,” impermeable is used in much the same way as impervious or impenetrable.

  7. not allowing liquid or gas to go through: an impermeable membrane. Synonyms. impenetrable. impervious (SUBSTANCE) specialized. Compare. waterproof adjective. watertight (NO WATER) weatherproof adjective. Opposite. permeable formal. SMART Vocabulary: related words and phrases. Physics: the state of matter. absorbency. acidic. allotropic.

  8. adjective. Something that is impermeable will not allow fluid to pass through it. [formal] The canoe is made from an impermeable wood. Synonyms: impenetrable, resistant, impervious, waterproof More Synonyms of impermeable. Collins COBUILD Advanced Learner’s Dictionary. Copyright © HarperCollins Publishers. Word Frequency.

  9. impermeable (to something) not allowing a liquid or gas to pass through. impermeable rock. The insulating material should be impermeable to water vapour. opposite permeable. Word Origin. Want to learn more?