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