忘恩负义

She was saddened by her son's ingratitude.

儿子的忘恩负她的心。

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

你说组织的这些骯脏的话，是忘恩负。

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，真让人难以相信。一人怎么可能这么忘恩负呢？

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忘恩负的政客。