cheeky

The little boy gave his mother a cheeky grin after stealing a cookie from the jar.

(Chinese) 从小罐里偷拿了一块曲奇后，那个小男孩对着妈妈露出了调皮的笑容。

He made a cheeky comment about the teacher's new haircut, making the whole class laugh.

(Chinese) 他对老师的新发型发表了一个调皮无礼的评价，逗得全班大笑。