Adjektive
shrewd [ shrewder ; shrewdest]
astute [ astuter ; astutest]
shifty [ shiftier ; shiftiest]
politic [ more politic ; most politic ]
crafty [ craftier ; craftiest ]
artful [ more artful ; most artful ]
canny [ cannier ; canniest]
wily [ wilier/more wily ; wiliest/most wily]
pestilent {med.}