This essay is just not good enough.

这篇散文实在是不够好。

《牛津词典》

Tell them it's just not good enough.

告诉他们这确实不够好。

《牛津词典》

It's over ten years old and although it was fine when it was first introduced, it is just not good enough now.

它已经有十多年的历史了，虽然刚推出的时候还不错，但现在已经不够好了。

youdao

"It is a movement in the right direction," "It is good, but it is just not good enough yet.

VOA: standard.2009.11.12

So, it's not really good enough to just have some risk of death-- it's got to be greater risk than usual.

所以，只冒某些死亡的风险,是不够的-,必须是比通常情况下更大的风险。

耶鲁公开课 - 死亡课程节选

Use your vote to tell Mr. Blair that it's just not good enough.

CNN: Tories slam Blair 'broken pledges'

There are times when asking a favor is just not good enough.

FORBES: There Are Times When Asking A Favor Is Not Enough

There are no guarantees other than his word, which for a people emerging from six decades of dictatorships is just not good enough.

BBC: Egypt crisis: 'Morsi has split the country down the middle'