impenetrability Meaning, Definition & Usage

  1. noun the quality of being impenetrable (by people or light or missiles etc.)
    imperviousness.
  2. noun incomprehensibility by virtue of being too dense to understand
    impenetrableness.

WordNet

Im*pen`e*tra*bil"i*ty noun
Etymology
Cf. F. impénétrabilité.
Definitions
  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.

Webster 1913