Perspicacious
Definition: shrewd; showing intelligence or insight
Why I Looked It Up
In a discussion of Abigail Adams:
Abigail Adams is best known for her copious, perspicacious correspondence in which she discussed politics as well as domestic concerns.
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From Once Upon a Tome:
From his paper-strewn desk in a dimly lit corner of the shop he watched over the books, guarding them with a suspender-clad perspicacity cultivated over many years…
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From On Paper:
Zhang’s stunning success is rooted in having the perspicacity to recognize the critical need and for developing an ingenious strategy to exploit it.