The inexcusable rudeness of the young man had a bad effect on the leader.

这位年轻人不可原谅的粗鲁无礼对这位领导人造成了很坏的影响。

The grassroots employee's inexcusable behavior put the department leader in an awkward position.

这位基层员工不可宽恕的行为让部门领导陷入了尴尬的境地。

He thinks that infidelity in marriage is inexcusable.

他认为婚内出轨行为是不可宽恕的。

He said the killing of innocent people was inexcusable.

他说滥杀无辜是不可原谅的。

Conditions are good in school. It's inexcusable not to study hard.

学校环境好，不用功念书可说不过去。

Your conduct is inexcusable.

你的行为是不能宽恕的。

I know this is inexcusable.

我知道是不可原谅的。

That would be inexcusable.

这将是不可原谅的。