halfhearted

He made a halfhearted attempt to clean his room, leaving most of the mess untouched.

用法提示：修饰尝试，表示不认真的态度。

The audience gave a halfhearted applause after the speaker's uninspiring presentation.

用法提示：修饰掌声，表示缺乏热情的回应。

Even though she promised to help, her halfhearted efforts were not enough to finish the project on time.

用法提示：修饰努力，说明缺乏兴趣和投入。