What is a synonym for regretfully?

Here are some synonyms for "regretfully," depending on the specific nuance you want to convey:

Formal:

* Sadly

* Sorrowfully

* With regret

* With a heavy heart

* Reluctantly

* With reluctance

* With apologies

* Apologetically

Informal:

* Sadly

* Unfortunately

* I'm sorry to say

* I'm afraid

* Sadly but truly

* Much to my regret

The best synonym depends on the context of the sentence. For example, "regretfully declined" might be best replaced with "reluctantly declined," while "regretfully informed" could be better expressed as "sadly informed."