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Superlative for not able to be overcome, subdued, or defeated
“The key to the Belgian defence along the Albert Canal was the supposedly impregnable fortress of Eben-Emael.”
Superlative for unable to be defeated or overcome
“Why, when you have an impregnable lead in the Tour de France, do you make a 140-kilometer solo escape, and add another eight minutes to your margin?”
Superlative for impossible to penetrate or pass through
“The Humboldt Glacier is probably the largest in the world, and it forms an impregnable barrier to Arctic explorations beyond it.”
Superlative for incontrovertible, beyond doubt or question
“I was struck by how fragile the outwardly impregnable theory of economics was.”
Superlative for certain to remain safe and unthreatened
Superlative for not allowing passage, typically fluid or gas
Superlative for crowded or packed closely together
Superlative for justifiable, well-maintained, or able to be defended
Superlative for never to be broken, infringed, or dishonoured
Superlative for unfaltering or unwavering
Superlative for not hackable
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