From The Collaborative International Dictionary of English v.0.44 [gcide]:
Impenetrability \Im*pen'e*tra*bil"i*ty\, noun [Cf. F. imp['e]n['e]trabilit['e].]
1. Quality of being impenetrable.
2. (Physics) That property in virtue of which two portions of matter can not at the same time occupy the same portion of space.
3. Insusceptibility of intellectual or emotional impression; obtuseness; stupidity; coldness.
From WordNet (r) 2.0 [wn]:
noun
1: resistance to penetration by a liquid [syn: {imperviousness}] [ant: {penetrability}, {penetrability}]
2: incomprehensibility by virtue of being too dense to understand [syn: {impenetrableness}]
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