impishly       
adverb uk/ˈɪm.pɪʃ.li/ us/ˈɪm.pɪʃ.li/
 顽皮地
in a way that takes pleasure in causing trouble, but may be funny and attractive 
  She grinned impishly at the camera.  她冲着镜头顽皮地笑了。 
 "Well, I’m not sure," he replied impishly. "嗯,我不确定,"他顽皮地回答道。 
 See: impish
 - More examples
 - After a minute he impishly raised his hand.
 - A big wave finally crashes down on our friend even as she impishly sticks out her tongue.
 - At times, he can be impishly charming.