unfortunately

Unfortunately, I won't be able to attend the meeting.

不幸的是，我无法参加会议。

Unfortunately, the weather was bad.

不幸的是，天气很糟糕。

He failed the exam, unfortunately.

遗憾的是，他考试没及格。

Unfortunately, there's nothing we can do.

遗憾的是，我们无能为力。

The store was unfortunately closed.

不幸的是，商店关门了。