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What is another word for impregnable?

Need synonyms for impregnable? Here's a list of similar words from our thesaurus that you can use instead.

Adjective
Not able to be overcome, subdued, or defeated
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“The key to the Belgian defence along the Albert Canal was the supposedly impregnable fortress of Eben-Emael.”
Adjective
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?”
Adjective
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.”
Adjective
Incontrovertible, beyond doubt or question
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“I was struck by how fragile the outwardly impregnable theory of economics was.”
Adjective
Certain to remain safe and unthreatened
Adjective
Not allowing passage, typically fluid or gas
Adjective
Crowded or packed closely together
Adjective
Justifiable, well-maintained, or able to be defended
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Adjective
Never to be broken, infringed, or dishonoured
Adjective
Unfaltering or unwavering
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