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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.
[Middle English imprenable, from Old French : in-, not (from Latin in-; see in-1) + prenable, pregnauble, pregnable; see pregnable.]
Capable of being impregnated.
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|Adv.||1.||impregnably - in an impregnable manner; "the sight of that bland, impregnably righteous face has been enough to make their blood run cold"|