Collins Chinese Dictionary Plus (3rd edition), 2011:
可惜 kěxī
I 形
regrettable
- 错(錯)过(過)了那个(個)工作机(機)会(會),真可惜! Cuòguò le nàge gōngzuò jīhuì,zhēn kěxī! What a shame you missed out on that job opportunity!
II 副
regrettably
- 可惜我不能参(參)加你们(們)的婚礼(禮)了。 Kěxī wǒ bùnéng cānjiā nǐmen de hūnlǐ le. Unfortunately, I can't attend your wedding.