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18.222.20.3
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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Im·pen·e·tra·ble·ness n. The quality of being impenetrable; impenetrability.
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From: WordNet (r) 2.0

 impenetrableness
      n : incomprehensibility by virtue of being too dense to
          understand [syn: impenetrability]