INTELLIGENT

adj. bright, smart, clever, discerning, perspicacious, perceptive, percipient, understanding, rational, apt, astute, quick, quick-witted, keen, sharp, alert, shrewd, canny, insightful, gifted, sensible, wise, sage, sagacious, enlightened, knowing, aware, knowledgeable, erudite, au fait, Colloq brainy, Chiefly US savvy She is certainly intelligent enough to be first in her class, if only she would study harder