[im-pen-i-truh-bil-i-tee, im-pen-]
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  1. the state or quality of being impenetrable.
  2. Physics. that property of matter by virtue of which two bodies cannot occupy the same space simultaneously.

Origin of impenetrability

First recorded in 1655–65; impenetr(able) + -ability Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of impenetrability