in vain [in vein]

以下由轻松背单词网站提供

徒劳；白辛苦

We tried in vain to make him change his mind.我们试图使他改变主意，结果是白费心机。
It was in vain that we tried to find his mother.我们百般设法找他的母亲，但毫无结果。