impenetrability

Im*pen`e*tra*bil"i*ty, n. Etym: [Cf. F. impénétrabilité.] 1. Quality of being impenetrable. 2. (Physics) Defn: That property in virtue of which two portions of matter can not at the same time occupy the same portion of space. 3. Insusceptibility of intellectual or emotional impression; obtuseness; stupidity; coldness.

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