Be halfhearted about something

指某人完全不认真对待某事

I wish you weren't so halfhearted about this new project! Get serious!

我希望你不要对这个新项目这么不上心！认真点！

She was rather halfhearted in her attempts to find a job.

她在找工作时态度相当漫不经心。

Have a change of heart

改变某人的想法

Fred had a change of heart and invited the young boy into his home.

福瑞德改变了主意，决定邀请年轻的男孩来自己的家。

I wish you would have a change of heart about Tim. He really deserves some help.

我希望你能改变对汤姆的看法。他真的值得你去帮助。