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The Collaborative International Dictionary
Impenetrability

Impenetrability \Im*pen`e*tra*bil"i*ty\, n. [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.

Wiktionary
impenetrability

n. The characteristic of being impenetrable; invulnerability.

WordNet
impenetrability
  1. n. resistance to penetration by a liquid [syn: imperviousness] [ant: penetrability, penetrability]

  2. incomprehensibility by virtue of being too dense to understand [syn: impenetrableness]

Wikipedia
Impenetrability

In metaphysics, impenetrability is the name given to that quality of matter whereby two bodies cannot occupy the same space at the same time.The philosopher John Toland argued that impenetrability and extension were sufficient to define matter, a contention strongly disputed by Gottfried Wilhelm Von Leibniz.

Locke considered impenetrability to be ''"more a consequence of solidity, than solidity itself."

Usage examples of "impenetrability".

They go on doing exactly as they have always done, not stodgily, exactly, but with a kind of dullness, a polite indifference and impenetrability, behind which may lie supreme self-satisfaction, or something quite different.

But she learned the impenetrability of that silence when she tried once to talk to him about Tesuque and Popeh.

To MORE this seemed like denying the existence of spirit, which he regarded as extended, and he postulated divisibility and impenetrability as the chief characteristics of matter.