忘恩

She was saddened by her son's ingratitude.

儿子的恩负义伤了她的心。

When you say such nasty things about the organization, you’re biting the hand that feeds you.

你说组织的些骯脏的话，是恩负义。

I can’t believe he didn’t even say thank you. How ungrateful can you get?

他甚至连谢谢都没说，难以相信。一怎可能恩负义呢？

He is not the first politician to kick down the ladder by which he has risen to exalted heights.

他不是第一被抬上高位便恩负义的政客。