Sa-gā’ciōŭs, a.

adjective

a. [Lat. sagax, sagacis, from sagire, to perceive quickly or keenly; Fr. & It. sagace, Sp. sagaz.]

Of quick perceptions; keen scented; skilled in following a trail. [Rare.] “Sagacious of his quarry from so far.” Milton.
Hence, informed by keen perceptions; perceiving. [Rare.]
Hence, also, of keen penetration and judgment; discerning and judicious; shrewd; sage; wise. “Sagacious heads.” Locke.

Instinct . . . makes them, many times, sagacious above our comprehension. Henry More. Syn.—Shrewd; quick; discerning; sage. See SHREWD.