Im·per·me·a·ble a. Not permeable; not permitting passage, as of a fluid. through its substance; impervious; impenetrable; as, India rubber is impermeable to water and to air. -- Im*per*me*a*ble*ness, n. -- Im*per*me*a*bly, adv.
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impermeableness
n : the property of something that cannot be pervaded by a
liquid [syn: impermeability] [ant: permeability]