English

Noun

impenetrableness ‎(uncountable)

1. The quality of being impenetrable.
   • 1783, William Godwin, Four Early Pamphlets:

     I need not add, that to a mind of elegance and sensibility, the emblematical allusion which this dress would carry to the secrecy and impenetrableness of the person that wears it, must be the source of a delightful and exquisite sensation.

   • 1919, Zane Grey, The Desert of Wheat:

     The stars, the night, the dark blue of heaven hid the secret in their impenetrableness.