cunning : 指凭诡计达到狡诈的目的。
- a cunning plan/ploy
- He's a very cunning man.
- a cunning liar
- He was as cunning as a fox.
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。
- He's a sly old devil - I wouldn't trust him with my money.
- a sly political move
- You sly old devil! How long have you known?