You searched for: “impregnability
impregnability (s) (noun) (no pl)
1. The quality or condition of being invincible or impossible to defeat or to destroy: As a boxer, Edward utilized his impregnability and so he was too powerful to be overcome by his opponents.
2. Etymology: from Middle French imprenable; im-, "not", + prendre, "to take" + -able, "able to be the object of an action".
This entry is located in the following units: -ability (page 5) prehend-, prehens- (page 2)