Examples from the Web for impenetrability
Hill sat looking at Hiram, who, with all his impenetrability wore a surprised and puzzled expression.
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