a virtually impenetrable or indestructible substance
I hardly thought the telescope would penetrate the impervium walls of the tower.
The hull is made of impervium—thousands of times harder than any other substance.
A half mile beneath the shallow Venusian sea the black impervium dome that protects Montana Keep rests frowningly on the bottom.
Farrell went on screaming. His throat seemed to be lined with impervium.
Someone or something was outside for through the thick impervium of the hull there came a muffled beating.
But don’t worry, the impervium plates on the ship will protect us!
We had no air, we had no water, we had no food and our drives—antique directors which had gone out with Lorrilard—had burned themselves into a dainty crisp of curled impervium.
It was proofed by a coating of impervium against the risk of meteorites striking.
Our armor was struck by multiple projectiles—five-gram impervium wirebombs.
Buck Rogers syndicated cartoon
(Impervium is now a trademarked name for a type of stainless steel)
Last modified 2021-01-26 16:48:01
In the compilation of some entries, HDSF has drawn extensively on corresponding entries in OED.