There is no linear order, but the range of words of various levels is legion. acute, adept, agile, alert, apt, astute, bold, brainy, bright, brilliant, brisk, canny, clever,crafty, effective, eggheaded, fresh, genius, good, impertinent, ingenious, keen, knowing, long-haired, nervy, nimble, on the ball, pert, pointed, quick, quick-witted, ready, resourceful, sassy, sharp, shrewd, skull, slick, whiz, wise, able alive, all there, calculating, capable, comprehending, creative, deep*, discerning, enlightened, exceptional, highbrow, imaginative, instructed, inventive, knowledgeable, original, penetrating, perceptive, perspicacious, profound, rational, ready, reasonable, responsible, sage, smart, thinking, together, understanding, well-informed, witty
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