From Longman Dictionary of Contemporary Englishre‧gret‧ta‧bly/rɪˈɡretəbli/adverbused to talk about a situation that youwishwas different or that you aresorryaboutSYNregretfully[sentence adverb]Regrettably, he will not be able to come.Examples from the Corpusregrettably•Regrettably...
(The band had worked so long he didn’t realize what time it was, and start saying it was a hard day’s work and then switched mid-sentence to calling it a hard day’s night.) When you’ve been working like a dog, accept no substitute descriptor. 46. Dirty Dancing (1987) ...