Definition of impregnable
- an impregnable fortress
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an impregnable fortress that had foiled one invader after another over the centuries
the castle's supposedly impregnable walls
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Since the days when the Norman French ruled England, English-speakers have been captured by the allure of French terms. Impregnable is one of the many English words that bear a French ancestry. It derives from the Middle French verb prendre, which means "to take or capture." Combining prendre with various prefixes has given our language many other words, too, including surprise, reprise and enterprise.
: not able to be captured by attack : very strong
: not likely to be weakened or changed
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