奸計[kankei] trick
佞奸[neikan] treacherous
奸物[kanbutsu] cunning man
奸悪[kanaku] wickedness
奸策[kansaku] shrewd (dirty) trick

奸知[kanchi] cunning
奸佞邪智[kanneijachi] wiles and cunning
奸黠[kankatsu] cunning
君側の奸[kunsokunokan] someone who curries favor with their master while secretly plotting against him