The meaning of IMPERMEABLE is not permitting passage (as of a fluid) through its substance; broadly : impervious. How to use impermeable in a sentence.

The male warrior is supposed to have a completely impermeable, sealed-up body that can not be penetrated by anything.

However, the water pores are completely impermeable to charged species, such as protons, a property critical for the conservation of the membrane's electrochemical potential difference.

Definition of impermeable adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Factsheet What does the adjective impermeable mean? There are three meanings listed in OED's entry for the adjective impermeable. See ‘Meaning & use’ for definitions, usage, and quotation …

Nov 30, 2025 · impermeable (comparative more impermeable, superlative most impermeable) Impossible to permeate. Not allowing passage, especially of liquids; waterproof.

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,” …

Impossible to permeate: an impermeable membrane; an impermeable border. im·per′me·a·bil′i·ty, im·per′me·a·ble·ness n.

Geology, Chemistry (of porous substances, etc.) not permitting a fluid to pass through: The tree cells have an impermeable membrane. im•per•me•a•bil•i•ty /ɪmˌpɜrmiəˈbɪlɪti/ n. [uncountable]

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 …