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Noun: impenetrability  im,pe-ni-tru'bi-li-tee
  1. The quality of being impenetrable (by people, light or missiles etc.)
    - imperviousness
  2. Incomprehensibility by virtue of being too dense to understand
    - impenetrableness

Derived forms: impenetrabilities

Type of: incomprehensibility, quality

Antonym: penetrability

Encyclopedia: Impenetrability