One of the mysteries of the English language finally explained.
1‘a shrewd businessman’
astute, sharp-witted, sharp, acute, intelligent, clever, alert, canny, media-savvy, perceptive, perspicacious, observant, discriminating, sagacious, sage, wise, far-seeing, far-sighted
cunning, artful, crafty, wily, calculating, disingenuous
informal on the ball, smart, savvy
British informal suss
Northern English Scottish informal pawky
North American informal heads-up
rare long-headed, sapient, argute
have all one's wits about one
stupid, unwise, ingenuous
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