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adjectiveimmune to attack; incapable of being tampered with
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adjectiveincapable of being overcome, challenged or refuted
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adjectivecapable of conceiving
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Definition that contains impregnable
- invulnerable immune to attack; impregnable
- maginot line a fortification built before World War II to protect France's eastern border; initially considered to be impregnable, it was easily overrun by the German army in 1940
- impregnably in an impregnable manner