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