Impenetrability
Pronunciation : Im*pen`e*tra*bil"i*ty
Part of Speech : n.
Etymology : [Cf. F. imp?n?trabilit?.]
Definition : 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.
Source : Webster's Unabridged Dictionary, 1913