Perceptive

a.

1.

Of or pertaining to the act or power of perceiving; having the faculty or power of perceiving; used in perception.

Adj.	1.	perceptive - of or relating to perception; "perceptive faculties"
	2.	perceptive - having the ability to perceive or understand; keen in discernment; "a perceptive eye"; "a perceptive observation" Antonyms: unperceiving, unperceptive - lacking perception; "as unperceptive as a boulder"

alert, alive, alive to, all-knowing, apperceptive, appercipient, apprehending, apprehensive, argute, astute, attentive, cogent, comprehending, farseeing, farsighted, foreseeing, foresighted, forethoughted, forethoughtful, gnostic, impressible, impressionable, impressive, incisive, insightful, intelligent, judicious, keen, knowing, knowledgeable, longheaded, longsighted, omniscient, on the ball, penetrating, percipient, perspicacious, perspicuous, piercing, prehensile, prehensive, provident, quick, quick-witted, receptive, responsive, sagacious, sage, sensile, sensitive, sensitive to, sentient, shrewd, sophic, susceptible, susceptive, trenchant, understanding, wise