1. 悔恨地,遗憾地:reject v. 陈述 | regrettably 悔恨地,遗憾地 | release v. 释放;发布;放开
2. 抱歉地:regrettable 可叹的 | regrettably 抱歉地 | regrind 再磨研
3. 遗憾地:regrettable 可惜的 | regrettably 遗憾地 | regrettably 可惜地
4. 可惜地:regrettably 遗憾地 | regrettably 可惜地 | regrind 磨配
adv
1. by bad luck
e.g. unfortunately it rained all day
alas, I cannot stay
Synonym: unfortunatelyunluckilyalas