a.

1. 狡猾的，狡詐的
   That sly girl managed to get her friend's job.

   那個詭詐的女孩設法取得她朋友的工作。

2. 詭祕的，悄悄的
   A slow sly smile was creeping around the corners of his mouth.

   他的嘴角慢慢露出了詭祕的微笑。

3. 會心的
   They exchanged sly looks and smiles.

   他們交換會意的眼色和微笑。

4. 惡作劇的，淘氣的
   The sly cat stole the meat while the cook's back was turned.

   淘氣的貓趁廚師轉身之機偷吃了肉。

adj.

1. having a cunning and deceitful nature.
2. (of a remark, glance, or expression) insinuating.
3. (of an action) surreptitious.