忘恩负义是可鄙的不道德行为.用英语怎么说？

忘恩负义是可鄙的不道德行为.

Ingratitude is a despicable vice.

ingratitude

n. 忘恩负义，得鱼忘荃；

例句
His friends were shocked by his ingratitude to his parents.
他对父母不孝,令他的朋友们大为吃惊.

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

despicable

adj. 可鄙的，卑鄙的；

例句
The Minister said the bombing was a despicable crime.
部长说这次爆炸是一起卑劣的罪行。

vice

n. 恶习，不道德行为，（肉体的）缺陷，疾病，（文体等的）缺点，瑕疵；prep. 代替，取代；adj. 副的，代替的；vt. 用老虎钳夹紧，钳制；

例句
His vice president also had to resign in disgrace...
他的副总统也被迫不光彩地辞去职务。