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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
“Then, without warning, you've got the world's number one goalkeeper in self-destruct mode, the England captain glancing an own goal home and a seemingly impregnable lead overturned.”
Adjective
Impossible to penetrate
Adjective
Unable to be disproved or argued against
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Adjective
Certain to remain safe and unthreatened
Adjective
Waterproof
Adjective
Crowded or packed closely together
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Adjective
Justifiable, well-maintained, or able to be defended
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Adjective
Never to be broken, infringed, or dishonoured
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