Im-pēn'e-tra-bil'i-ty, n.

n. [Fr. impénétrabilité, It. impenetrabilità, Sp. impenetrabilidad.]

1. The quality of being impenetrable.
2. (Physics.) That property of matter by which it excludes all other matter from the space it occupies.
3. Insusceptibility of intellectual impression; obtuseness; stupidity.
4. Incapability of being moved or affected; want of sympathy or susceptibility; coldness.