just not

Tell them it's just not good enough.

告诉他们这确实不够好。

It's just not physically possible to finish all this by the end of the week.

要在本周末完成这一切，这在客观上是办不到的。

It is just not credible that she would cheat.

她会行骗简直难以置信。

I know that he has tried hard; be that as it may, his work is just not good enough.

我知道他已经尽力了，尽管如此，他的工作仍不太理想。

It's just not feasible to manage the business on a part-time basis.

兼职管理业务是搞不好的。

It's just not 100% of its focus.

只是没有100%投入

Your work is just not good enough.

你的工作真是不够好。

We could probably trust her with the information but it's just not worth the risk.

我们也许可以将这些资料托付给她，但实在不值得去担这样的风险。

We're just not following the letter of the law. 。

我们只是没有依法行事。

Some members of the team are just not doing their stuff.

队中几名成员压根儿没有使出自己的本事。

This essay is just not good enough.

这篇散文实在是不够好。