Regretfully vs. Regrettably
Regretfullyadverb
In a regretful manner, with regret.
Regretfullyadverb
(proscribed) Unfortunately, in a manner inspiring or deserving regret; used only as a sentence adverb (to introduce and modify an entire sentence).
Regretfullyadverb
with regret (used in polite formulas);
Regrettablyadverb
In a manner inspiring or deserving regret.
Regrettablyadverb
by bad luck;
Regrettablyadverb
unfortunately (used to express apology for or sadness at something)
