Definition of regretfully adverb from the Oxford Advanced Learner's Dictionary

     

    regretfully

     adverb
    adverb
    BrE BrE//rɪˈɡretfəli//
     
    ; NAmE NAmE//rɪˈɡretfəli//
     
     
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  1. 1in a way that shows you are sad or disappointed about something ‘I'm afraid not,’ he said regretfully. Emma shook her head regretfully.
  2. 2used to show that you are sorry that something is the case and you wish the situation were different synonym regrettably There is, regretfully, no space in this article to examine all these issues. Regretfully, mounting costs have forced the museum to close. Which Word?regretfully / regrettably Regretfully and regrettably can both be used as sentence adverbs to show that you are sorry about something and wish the situation were different:Regretfully, some jobs will be lost. Regrettably, some jobs will be lost. Regretfully can also be used to mean ‘in a way that shows you are sad or disappointed about something’:He sighed regretfully.
See the Oxford Advanced American Dictionary entry: regretfully