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re‧gret‧ful‧ly

1 feeling sad because you do not want to do what you are doing :
'I must go,' he said regretfully.
'I must go,' he said regretfully.2 [sentence adverb] formal used to talk about a situation that you wish was different or that you are sorry about [= regrettably]:
Regretfully, we do not have time to continue this discussion now.
Regretfully, we do not have time to continue this discussion now.