From Longman Dictionary of Contemporary Englishregrettablyre‧gret‧ta‧bly /rɪˈɡretəbli/ adverb PITY/IT'S A PITYused to talk about a situation that you wish was different or that you are sorry about SYN regretfully[sentence adverb] Regrettably, he will not be able to come.
Examples from the Corpus
regrettably• Regrettably, a lot of the work in the show is of poor quality.• The poor and disadvantaged will, regrettably, be the ones to suffer as a result of the new law.• As for this debut, it comes to us regrettably before its time.• Today, regrettably, Churchillian honesty in high places is less fashionable.• The incident had simply been a regrettably dramatic way to begin his first week home from Ireland.• Over the years, more money has been put into education, but regrettably in certain areas little has been achieved.• Some of these incidents occurred, regrettably, in public.• Mr. Hart's comments were regrettably inappropriate.• Regrettably Jousse's work has not been translated into English.• The two works choreographed by Alley have regrettably little to offer where dance idioms are concerned.• We have considered a topic which is, perhaps regrettably, not at the centre of Anglican attention.• Attempts to denigrate his playing simply because of his popularity are misplaced but regrettably widespread. 