adjective
EXAMPLES FROM CORPUS
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And Andrus would be untouched, impregnable behind his rigid simplicities.
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Grant was still mired in the mud before impregnable Vicksburg.
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Occupying fairly impregnable clifftop villages, they prospered in the practice of agriculture.
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Subject, verb, object: the unadorned, impregnable sentence.
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The case Starr builds must be as impregnable as Fort Knox.
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The conventional wisdom having been made more or less identical with sound scholarship, its position is virtually impregnable .
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The one factor that still tilts general election predictions in the Tories' favour is that their hillcrest position seems ultimately impregnable .
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The problem invariably is that the enemy is simply inflexible or impregnable .