adj
impregnable
ihm-PREHG-nuh-bl
adj
1
Too strong or well-defended to be captured, broken into, or defeated.
"The castle's thick walls made it seem impregnable."
"Her lead in the polls looked impregnable until the final week of the campaign."
How to Use Impregnable
Learner’s notesIn plain EnglishSo strong, secure, or well-defended that it can't be broken or beaten.
Common pairings
impregnable fortress
impregnable defence
impregnable lead
Word Forms
more impregnable comparative, more impregnable comparative, most impregnable superlative, most impregnable superlative
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Etymology
From Old French imprenable, "impossible to capture," from im- + prenable ("takable," from prendre, "to take"). The "g" was added later by analogy with words like reign and deign.