- 1in a way that shows you are sad or disappointed about something “I'm afraid not,” he said regretfully. Emma shook her head regretfully.
- 2used to show that you are sorry that something is the case and you wish the situation were different There is, regretfully, no space in this article to examine all these issues. Regretfully, mounting costs have forced the museum to close. Which Word?regrettably / regretfully Regrettably is used as a sentence adverb to show that you are sorry about something and wish the situation were different:Regrettably, some jobs will be lost. Regretfully can be used in the same way, but is more frequently used to mean “in a way that shows you are sad or disappointed about something”:He sighed regretfully.