impish

The boy had an impish grin on his face just before he hid his sister's shoes.

(Chinese) 那个男孩在藏起姐姐的鞋子之前，脸上露出了顽皮的笑容。

Her impish sense of humor often led to harmless practical jokes in the office.

(Chinese) 她那顽皮的幽默感经常导致办公室里出现一些无伤大雅的小恶作剧。