Adjective
Not permeable; not permitting passage, as of a fluid. through its substance; impervious; impenetrable; as, India rubber is impermeable to water and to air.
Source: Webster's dictionaryA dense film of a conventional surfactant is quite impermeable. On the other hand, a dense film of Janus grains always has some interstices between the grains, and allows for chemical exchange between the two sides; "the skin can breathe." Pierre-Gilles de Gennes
impermeable stone Source: Internet
an impermeable layer of scum Source: Internet
a coat impermeable to rain Source: Internet
Aspirin (acetylsalicylic acid) is a carboxylic acid Cell membranes are generally impermeable to charged or large, polar molecules because of the lipophilic fatty acyl chains comprising their interior. Source: Internet
Furthermore, the epithelium of the distal convoluted tubules and collecting ducts is impermeable to water in the absence of antidiuretic hormone (ADH) in the blood. Source: Internet