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Comparative 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.”
Comparative 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?”
Comparative 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.”
Comparative for incontrovertible, beyond doubt or question
“I was struck by how fragile the outwardly impregnable theory of economics was.”
Comparative for certain to remain safe and unthreatened
Comparative for not allowing passage, typically fluid or gas
Comparative for crowded or packed closely together
Comparative for justifiable, well-maintained, or able to be defended
Comparative for never to be broken, infringed, or dishonoured
Comparative for unfaltering or unwavering
Comparative for not hackable
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