ingratitude
n. 忘恩负义
例句
He upbraided her with her ingratitude.
他谴责她忘恩负义。
His ingratitude cut me to the heart.
他的忘恩负义伤透了我的心。
There would be no cycles save for the never-ending cycle of ingratitude.
从此除了忘恩负义的无休止循环将不再有其他循环了。