人心不古的英文：
[Literal Meaning]
people/heart/not/traditional
Public morality is not what is used to be.

[解释]
古：指古代的社会风尚。指人心奸诈、刻薄，没有古人纯朴。

[Explanation]
Public morality is not what is used to be.

[例子]
现在社会人心不古，诈骗的案件越来越多。

[Example]
Now public morality is not what is used to be in society and cases of frauds keep increasing.