perspicacious

/ˌpər-spə-ˈkā-shəs/

Latin perspicac-, perspicax, from perspicere

adjective

of acute mental vision or discernment : keen

shrewd sagacious perspicacious astute mean acute in perception and sound in judgment. shrewd stresses practical, hardheaded cleverness and judgment. sagacious suggests wisdom, penetration, and farsightedness.