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impenetrability

[im-pen-i-truh-bil-i-tee, im-pen-] /ɪmˌpɛn ɪ trəˈbɪl ɪ ti, ˌɪm pɛn-/
noun
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
1655-1665
1655-65; impenetr(able) + -ability
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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