impenetrability

[ im-pen-i-truh-bil-i-tee, im-pen- ]

/ ɪmˌpɛn ɪ trəˈbɪl ɪ ti, ˌɪm pɛn- /

the state or quality of being impenetrable.

Physics. that property of matter by virtue of which two bodies cannot occupy the same space simultaneously.

RELATED WORDS

First recorded in 1655–65; impenetr(able) + -ability

Hill sat looking at Hiram, who, with all his impenetrability wore a surprised and puzzled expression.
The Continental Monthly , Vol. 2 No. 5, November 1862|Various
A great physicist tells us that, when dealing with sufficiently high speeds, matter has no such property as impenetrability.
Carmen Ariza|Charles Francis Stocking
Nothing was more remarkable than his impenetrability to ridicule and censure.
Arthur Mervyn|Charles Brockden Brown
His impenetrability had been smiling ever since the morning.
Les Misrables|Victor Hugo

He looked back with baffling, inscrutable eyes, his dark face masklike in its impenetrability.
The Lamp in the Desert|Ethel M. Dell