Bubbleheaded
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reliable, quick, calm, fast, bright, constant, crafty, schooled, discerning, knowledgeable, sapient, intelligent, Sharp-witted, brilliant, highbrow, smart, resourceful, logical, shrewd, steady, literate, reasonable, clever, sound, savvy, quick-witted, scholarly, sage, supersmart, well-read, sensible, stable, ingenious, keen, tranquil, astute, serious, percipient, unchangeable, well-advised, level-headed, sagacious, responsible, acute, judicious, sure, hyperintelligent, erudite, trained, rational, informed, intellectual, nimble, sane, brainy, wily, predictable, skilled, apt, perspicacious, thinking, careful, prudent, wise, knowing, ultrasmart, valid, educated, unvarying, learned, insightful, cerebral, certain, foxy, cunning, perceptive, unchanging, sharp.