Definition of "impregnability" [im•preg•na•bil•i•ty]

• The quality or state of being impregnable; invincibility. (noun)

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• "Only his successor, Tony Blair, arguably the most un-Labour leader of all, enjoyed years of respect and seeming impregnability."
• "After 10 years of chasing the dream of impregnability and now trillions of dollars poorer, we have more enemies then ever."
• "They were so confident of the impregnability of their fortress that they called down to Alexander saying he would never take the place unless his soldiers had wings."