What does "sagacious" mean?

Sagacious: Hence, of quick intellectual perceptions; of keen penetration and judgment; discerning and judicious; knowing; far-sighted; shrewd; sage; wise; as, a sagacious man; a sagacious remark. Instinct . . . makes them, many times, sagacious above our apprehension. Dr. H. More. Only sagacious heads light on these observations, and reduce them into general propositions. Locke. -- Sa*ga"cious*ly, adv. -- Sa-ga"cious*ness, n.