unhappily

ADV You use unhappily to introduce or refer to a statement when you consider it to be sad and wish that it were different. 不幸地 [ADV with cl] ^[1] 

Unhappily, such good luck is rare.

遺憾的是，這樣的好運太少了。

Unhappily the facts do not wholly bear out the theory.

遺憾的是，事實不完全證實該理論。

Unhappily, he had done no more than pay lip service to their views.

不幸的是，他對他們的觀點只予以口頭上的支持。 ^[1]