冷酷的
mephistophelean adj : showing the cunning or ingenuity or wickedness typical of a devil; "devilish schemes"; "the cold calculation and diabolic art of some statesmen"; "the diabolical expression on his face"; "a mephistophelian glint in his eye" [syn: {devilish}, {diabolic}, {diabolical}, {mephistophelian}]