impermeable

It is the fantasy of an impermeable barrier that allows one’s purity to remain unsullied.

By that they mean, if not quite wiping out the Conservatives, chipping away yet further at what had long seemed impermeable Tory territory primarily in southern England.

Roberts said that Chiquita Canyon was far behind schedule with the installation of a large impermeable cover, which was intended to suppress odors.

The almost impermeable consensus was that Harris needed a white man as her running mate, preferably from a swing state.

Their technology involves pumping through fissures in the ground and squirting the carbon-rich material thousands of feet down, beneath a rock layer that should be impermeable for centuries.