slyly
adv. 狡猾地；秘密地；俏皮地
例句
He glanced at her slyly.
他诡秘地朝她瞥了一眼。
《牛津词典》
Anna grinned slyly.
安娜会意地咧嘴笑了。
《柯林斯英汉双解大词典》
He would allow John slyly to copy his answers to impossibly difficult algebra questions.
对于那些特别难的代数题，他允许约翰偷偷抄袭他的答案。
