这是一件不光彩的事情，急需进行彻底的调查。

This is a disgraceful state of affairs and cries out for a thorough investigation.

《柯林斯英汉双解大词典》

比如说，一般认为辞职是一件不光彩的事情，即使这个工作你才做了很短的时间。

For example, it is not considered dishonorable to quit a job, even if you have had it for only a short time.

youdao

我觉得敢于承认不光彩的事情是可敬的，大卫递交辞呈后，这件事应该可以就此打住了。

I think some dishonorable things were done and the honorable thing has to be to resign and not to go forward.

youdao