regretfully
Adverb
Meaning
with regret (used in polite formulas)
Source: WordNetSynonyms
Antonyms
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When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us.
I must regretfully decline your kind invitation
He changed his mind after finding out he would be returned to the same jail in Washington, D.C. He regretfully said: "My conscience tells me I should have gone (to jail), but I was shaking all over.
A touch regretfully, to my mind, the contest is not known as the Dirt Bowl").
The Doctor regretfully informs her that there is no difference in forethought.
While we were tempted by the $15 bottomless mimosa deal, the fact that we (regretfully) needed to drive after dissuaded us.