没心没肺用英语怎么说

heartless 这一个词就可以了
如果指没心没肺的人，那么可以用一句地道的英语：barking dog 。

没心没肺
1. [没良心] heartless
2. [缺心眼] thoughtless
3. [过于单纯] simple-minded

没心没肺
simple-minded
scatter-brained

我们一般批评忘恩负义或拂逆盛情的人为没心没肺，所以较通俗的翻译是

Ungrateful

not know what's good for one

without thinking and sad