• sapient, knowledgeable, quick-witted, keen, cunning, acute, savvy, erudite, perceptive, cerebral, crafty, discerning, ultrasmart, smart, sensible, sound, judicious, literate, well-read, prudent, wily, resourceful, astute, insightful, clever, well-advised, Sharp-witted, bright, brainy, perspicacious, fast, skilled, sharp, shrewd, highbrow, sage, learned, wise, foxy, rational, informed, thinking, scholarly, trained, knowing, ingenious, percipient, reasonable, logical, hyperintelligent, quick, apt, schooled, educated, sagacious, nimble, sane, valid, supersmart, intellectual, brilliant.