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Meaning of impenetrable

im•pen•e•tra•ble

Pronunciation: (im-pen'i-tru-bul), [key]
— adj.
  1. not penetrable; that cannot be penetrated, pierced, entered, etc.
  2. inaccessible to ideas, influences, etc.
  3. incapable of being understood; inscrutable; unfathomable: an impenetrable mystery.
  4. possessing impenetrability.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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