cunning与sly这两个形容词均含“狡猾的”之意。
cunning : 指凭诡计达到狡诈的目的。
- 他不得不与一个冷静、聪明而又狡猾的对手斗智。
He has to pit his wits against an adversary who is cool, clever and cunning. - 他是一个机敏而又多才多艺的才子。但他却用了卑鄙的欺诈手段来获取他想得到的东西。
He is a nimble and versatile wit. But he used low cunning to get what he wanted.
（拓展学习：小词详解 | cunning）
sly : 指竭力掩饰其意图，靠蒙混或表里不一等隐蔽手法达到个人目的。
- a sly political move
诡诈的政治手段 - He's a sly old devil - I wouldn't trust him with my money.
他是个老滑头——我不会把钱交托给他的。
