The Oxford Thesaurus An A-Z Dictionary of Synonyms - astuteadj.

1) shrewd, subtle, clever, ingenious, adroit, wily, cunning, calculating, canny, crafty, artful, arch, sly, foxy, guileful, underhand, underhanded; Rare astucious: He had the reputation of being an astute businessman. 2) sharp, keen, perceptive, observant, alert, quick, quick-witted, sage, sagacious, wise, intelligent, insightful, perspicacious, discerning, knowledgeable: That was a very astute comment, Smedley.