regrettable和regretful的区别：含义不同、用法不同、强调重点不同。regrettable的含义为“令人惋惜的”、“可惜的”，是指形容一件事情；regretful作为形容词，含义为“后悔的”、“失望的”，是指形容一个人的心境。

regrettable作为形容词，意为令人惋惜的;可惜的;令人遗憾的。

例句：It is regrettable that the police were not informed sooner.

遗憾的是没有早些报警。

The loss of jobs is highly regrettable.

失去工作非常令人遗憾。

It is regrettable that strike leaders seem intent on spoiling holidays.

遗憾的是罢工领导人似乎决意要破坏节日的气氛。

A person who does a regrettable action is often regretful afterwards.

行为不检点的人，日后往往懊悔。

His tiredness caused him to make a regrettable error.

使人懊悔的他由于疲劳而犯了个令人遗憾的错误。

Rush things and you'll just end up in a regrettable muddle.

冲动鲁莽只会使你陷入后悔的泥潭。

It is regrettable that John failed the test.= John's failure to pass the test is regrettable.

约翰考试未及格真令人遗憾。

regretful作为形容词，意为后悔的;失望的;令人惋惜的;遗憾的。

例句：Surprisingly, she didn't feel nervous, or regretful about her actions.

令人惊讶的是，她并没有对她的行为感到紧张或后悔。

One can imagine how regretful he was.

可以想像他是多么懊悔。

It is regretful that you cannot advance time of delivery.

很遗憾，贵方不能够提早交货。

After upsetting the plate of food, the child showed a regretful smile.

打翻了那碟食物后，小孩抱歉地一笑。

I am very regretful for my crude behavior.

我对我粗鲁的行为很后悔。

It is regretful that you can not grant our request.

很遗憾得知贵公司不能接受我们的退货请求。