regrettable /rɪˈɡrɛtəbəl/

• 1. 

  ADJ You describe something as regrettable when you think that it is bad and that it should not happen or have happened. 不幸的 [正式]

  例：

  The army said it had started an investigation into what it described as a regrettable incident.

  军方说已经开始调查这起据称的不幸事件。

• 2. 

  regrettably ADV 不幸地

  例：

  Regrettably we could find no sign of the man and the search was terminated.

  不幸，我们无法找到这个人的任何踪迹因此搜寻停止了。