regret的形容詞令人惋惜的

This is more than regrettable; it is dangerous.

這不僅僅是令人感到遺憾的，更是危險的。

It is regrettable that you should make such a remark.

很可惜你竟然説這些話。

Yesterday is regrettable, tomorrow still hypothetical.

昨天已經逝去，明天還未到來。