他知道该做什么，他就是极其懒惰。

He knows what has to be done, he's just ___bone idle.

我必须承认，我年轻时有时很懒惰。

I must admit I was sometimes ___idle when I was younger.

尽管很有潜力，他却依然懒惰，浪费了自己的才华。

For all his potential, he remains ___idle and wastes his talent.