perspicacity:

perspicacity (pûr-spĭ-KĂS-ĭ-tē)

Definition (Noun) Clearness of understanding or insight; great mental penetration; discernment. In Context “By now Coucy was a member of the Royal Council, clearly relied on by Charles V for his perspicacity and diplomacy.” Barbara W. Tuchman, A Distant Mirror: The Calamit
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