别对你弟弟这么刻薄——他比你小四岁！

Don't be so ___nasty to your brother - he's four years younger than you!

我以为那是一个朋友开的恶毒玩笑。

I thought it was a ___nasty joke made by a friend.

她对同事的演讲发表了一番刻薄的评论。

She made a ___nasty comment about her coworker's presentation.