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.

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

As a tunnelling medium, the chalk was ideal: homogeneous, largely without fractures and nearly impermeable. Perhaps the swarms had been trained by their experience at the lab to think doors and …

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

Jan 15, 2026 · Adjective impermeable (comparative more impermeable, superlative most impermeable) Impossible to permeate. Not allowing passage, especially of liquids; waterproof.

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.

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 evidence.

Impermeable refers to a state or quality of a material or surface not allowing any substances such as liquids, gases, or other elements to pass through it. Practically, it means being resistant to …

Impermeable definition: Not permeable; not permitting fluids to pass through it; impenetrable.