sly
adj
(-er, -est)
1 (often derog 常作贬义) acting or done in a secret, often cunning and deceitful, way 狡猾的; 狡诈的
a sly fellow, trick, ruse 狡诈的家伙、 伎俩、 计谋
(joc 谑) You sly old devil! 你这个老奸巨猾的家伙!
It was sly of you not to tell us you'd already met. 你们真坏, 已经见了面还瞒著我们.
2 [usu attrib 通常作定语]
suggesting that one knows sth secret; knowing 会意的; 会心的
a sly smile, look, etc 会心的一笑、 表情等
She cast a sly glance at her bridge partner. 她向桥牌搭挡使了个会意的眼色.
3 mischievous; playful 淘气的; 顽皮的
play a sly trick on a friend 作弄朋友.
4 (idm 习语) on the `sly secretly 秘密地
She must have been having lessons on the sly. 她准是暗地里一直在上课.
It took him some time to connect the long rubber pipe to the air supply pipe that ran round the port, but at last it was done and as a result work was able to progress much faster.