clever

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

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

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