What is another word for impregnably?

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

Adverb 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.”
Adverb for 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.”
Adverb for impossible to penetrate
Adverb for unable to be disproved or refuted
Adverb for certain to remain safe and unthreatened
Adverb for able to be maintained or defended against attack or objection
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Adverb for dangerous or perilous
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