adv.令人遗憾地,使人懊悔地
Regrettably we have to house families in these inadequate flats.
很遗憾,我们不得不让住户挤在这些狭小的公寓里。
The incidents are regrettably true.
很可惜这些事件都是真实的。
The speaker was regrettably indisposed.
很遗憾,演讲人身体不适。