Sentence examples similar to impregnable fellowship from inspiring English sources

An impregnable theory, or one nearing the limit of impregnability, is in fact as great an absurdity as an impregnable armour-plate.

An impregnable assertion.

Is that defence impregnable?

The enigma seems impregnable.

"Bell Canada is impregnable".

To many, Google appears impregnable.

The Confederate entrenchment was impregnable.

The death penalty seemed impregnable.

"Impregnable" was an autoantonym, too.

No system, however, is impregnable.

The double bill looked impregnable.