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WORDNET DICTIONARY

Noun imperviousness has 1 sense

• imperviousness(n = noun.attribute) impenetrability - the quality of being impenetrable (by people or light or missiles etc.); Array
is a kind of quality
Derived form adjective impervious₁
Antonym: perviousness

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imperviousness

Closure

N closure, occlusion, blockade, shutting up, obstruction, embolus, contraction, infarction, constipation, obstipation, blind alley, blind corner, keddah, cul-de-sac, caecum, imperforation, imperviousness, impermeability, stopper, closed, shut, operculated, unopened, unpierced, imporous, caecal, closable, imperforate, impervious, impermeable, impenetrable, impassable, unpassable, invious, pathless, wayless, untrodden, untrod, unventilated, air tight, water tight, hermetically sealed, tight, snug.

For further exploring for "imperviousness" in Webster Dictionary Online