He is regretful to the whole thing.

他对整件事都感到后悔。

I will never be regretful for what I have done.

我绝不会为所做的事情感到后悔。

A person who misbehaves is often regretful afterwards.

行为不端的人往往事后后悔。

He didn't even seem regretful about what he did. I can't believe it.

他甚至对自己的所作所为都不感到后悔。我真不敢相信。

Mr. Griffin gave a regretful smile.

格里芬先生遗憾地笑了笑。

One can imagine how regretful he was.

可以想像他是多么懊悔。

That's good news for the regretful.

对于遗憾来说这是一个好消息。

I try to look regretful, and obliging.

我试着让自己看上去带着遗憾并且亲切。

We feel regretful to his decision.

我们对他的决定感到遗憾。