忘恩负义的英文：
[Literal Meaning]
forget/favor/not live up to/morality
to forget the favors bestowed by others and let others down

[解释]
恩：恩惠；负：辜负。忘记别人对自己的好处，反而做出对不起别人的事。

[Explanation]
ungratefulness

[例子]
虽然这么多年没有和你联系，但我绝不是一个忘恩负义的人。

[Example]
Although I haven't contacted you these years, I'm not a person who are ungrateful.

[英文等价词]
to cherish a snake in one's bosom

Be ungrateful;devoid of all gratitude
忘恩负义

cherish [ nourish ] a viper in one's bosom
厚待忘恩负义的人,姑息养奸

To be ungrateful and act contrary to justice
忘恩负义

to kick down (or over) the ladder;To bite the hand that feeds one
忘恩负义

Do not cut down the tree that gives you shade
不要忘恩负义

Lack of gratitude; ungratefulness.
没有感谢之意的；忘恩负义的

upbraid sb.with his ingratitude [ for being ungrateful ]
责备某人忘恩负义

His ingratitude disappointed us.
他的忘恩负义使我们失望。

Her ingratitude stung him.
她的忘恩负义使他痛心。

ungrateful adj.
忘恩负义的；使人不愉快的；徒劳的；讨厌的