1. cagey, cagy, canny, clever, smart (vs. stupid)

usage: showing self-interest and shrewdness in dealing with others; "a cagey lawyer"; "too clever to be sound"

2. apt, clever, intelligent (vs. unintelligent)

usage: mentally quick and resourceful; "an apt pupil"; "you are a clever reason well and your wit is bold"-Bram Stoker

3. clever, cunning, ingenious, adroit (vs. maladroit)

usage: showing inventiveness and skill; "a clever gadget"; "the cunning maneuvers leading to his success"; "an ingenious solution to the problem"

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See also: clever (Dictionary)