regrettable

• 可惜白白浪费了这么多时间。

  It's a shame that so much time has been wasted for nothing.

• 多么可惜。

  Such a pity.

• 可惜人已经去北京了。

  It's too bad that he's already left for Beijing.

• 可惜我没来得及。

  Unfortunately I didn't get there in time.

• 可惜我帮不上你的忙。

  Regrettably, I cannot help you.

• 事情如果不成，那就太可惜了。

  It will be such a shame if it cannot be done.

• 一点儿也不可惜。

  It's not a pity at all.