impenetrability

impenetrability (countable and uncountable, plural impenetrabilities)

1. The characteristic of being impenetrable; invulnerability.
   • 1651, uncredited translator, Naturall Philosophie Reformed by Divine Light, or, A Synopsis of Physicks by J. A. Comenius, London: Thomas Pierrepont, Chapter 4, “Of the tangible quality,”

     Humidity (or humour) is the liquidnesse of the parts of the body, and aptnesse to be penetrated by one another; siccity on the contrary is a consistency, and an impenetrability of the parts of the body.

   • 1904, Joseph Conrad, Nostromo, Part 2, Chapter Five,

     What does Don Carlos Gould think of that? But, of course, with his English impenetrability, nobody can tell what he thinks.

   • 1924, Ford Madox Ford, Some Do Not ..., Part I, Chapter 7, in Parade’s End, New York: Knopf, 1950, p. 137,

     He watched intently the place where she must appear; it would give him pointers about the impenetrability of mist to the eye.

   • 2007, J. K. Rowling, Harry Potter and the Deathly Hallows, New York: Scholastic, Chapter 13, p. 247,

     As he passed gleaming wooden door after gleaming wooden door, each bearing a small plaque with the owner’s name and occupation upon it, the might of the Ministry, its complexity, its impenetrability, seemed to force itself upon him so that the plan he had been carefully concocting with Ron and Hermione over the past four weeks seemed laughably childish.