13
unfortunately(adverb, sadly, alas, unluckily, disastrously)
11
remorsefully(adverb, alas, penitently, repentantly)
8
ruefully(adverb, remorsefully, repentantly)
8
contritely(adverb, remorsefully, penitently, repentantly)
7
penitently(adverb, remorsefully, penitently, repentantly)
7
sorrowfully(adverb, unhappily, repentantly)
6
mournfully
5
apologetically(adverb, remorsefully, penitently, repentantly)
5
sadly(adverb, alas)
5
lamentably
5
regrettably(adverb, alas)
4
repentantly(adverb, remorsefully)
4
unhappily
3
gloomily
3
sorrily
2
ashamedly
2
atoningly(adverb, penitently)
2
dolefully
2
drably
2
grievingly
11 years ago|4.7k views|share |citing 
APASmart Define. (2015). regretfully thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/regretfully/thesaurus/synonyms
ChicagoSmart Define. 2015. "regretfully thesaurus" https://smartdefine.org/regretfully/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, regretfully thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/regretfully/thesaurus/synonyms>.
MLASmart Define. "regretfully thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/regretfully/thesaurus/synonyms>