regret的形容词令人遗憾的
regrettable adj. 令人遗憾的；可惜的；可悲的；抱歉的；
The manner in which the decision was announced was extremely regrettable.
宣布决定的方式非常令人遗憾。
He has committed a regrettable mistake.
他犯了一个令人遗憾的错误。
Very regrettable, I had no learned.
很遗憾，我没学到。
It is regrettable that he has passed away.
令人遗憾的是你不能和我们一起去旅游。
This is more than regrettable; it is dangerous.
这不仅仅是令人感到遗憾的，更是危险的。