Synonyms of shrewd

1 Syllable
smart, sharp, slyer, wise, keen, shark, smooth, deep, sliest, sly, slick, slier, slyest, wily
2 Syllables
probing, cunning, sapient, clever, smartest, devious, profound, sager, true-life, smarter, cagier, tricky, dextrous, foxy, cannier, cagey, einstein, brainy, sneaking, knowing, heady, cautious, smarted, wilier, prudent, street-smart, piercing, shifty, crafty, wiser, canny, wisest, shiftier, witted, savvy, farseeing, cutting, shiftiest, craftier, artful
3 Syllables
provident, politic, realistic, streetwise, judicious, eggheaded, inside, farsighted, ingenious, designing, underhand, astucious, insightful, discerning, astute, cleverest, quick-witted, sharp-sighted, cleverer, judgmatic, efficient, clear-sighted, well-judged, slippery, well-thought-out, argute, far-sighted, guileful, sensible, smooth-spoken, profoundest, hardheaded, sagacious, acute
4 Syllables
commonsense, unfantastic, diplomatic, calculating, well-prepared, unwasteful, unromantic, serpentine, perceptive, forethoughtful, nimble-witted, penetrating, perspicacious, snakelike, deviceful, well-reasoned, machiavellian, pragmatical
5 Syllables
naturalistic, penetrative, discriminating, innovational
6 Syllables
prevaricatory, manipulative