impenetrableness

English

Etymology

impenetrable +‎ -ness

Noun

impenetrableness (uncountable)

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

     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^[2]:

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