Impregnable is one of the many English words that bear a French ancestry, thanks to the Norman conquest of England in 1066. It derives from the Middle French verb prendre, which means "to …

IMPREGNABLE definition: strong enough to resist or withstand attack; not to be taken by force, unconquerable. See examples of impregnable used in a sentence.

Physically strong and powerful (Definition of impregnable from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

If you describe a building or other place as impregnable, you mean that it cannot be broken into or captured. The old Dutch fort with its thick high walls looks virtually impregnable. In those …

Definition of impregnable adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

1. Impossible to capture or enter by force: an impregnable fortress. 2. Difficult or impossible to attack, challenge, or refute with success: an impregnable argument.

Dec 28, 2025 · Adjective impregnable (comparative more impregnable, superlative most impregnable) Capable of being impregnated; impregnatable. Antonym: unimpregnable

WordReference Random House Unabridged Dictionary of American English © 2024 im•preg•na•ble1 (im preg′ nə bəl), adj. strong enough to resist or withstand attack; not to be …

Difficult or impossible to attack, challenge, or refute with success. An impregnable argument.

When something is impregnable it is not easily taken by force and can stand up to any attack. We usually use it in reference to some form of protection, like a fort or a solid defensive line in …