regretfully
regrettingly
lamentably
regretful
fear
ruesome
guilt
regrettable
remorse
self-reproach
compunction
whip the cat
repine
too bad
regrettableness
regrettably
seem like a good idea at the time
eat one's words
apologize
ochanee
wear sackcloth and ashes
shame
sayang
remorsefully
regretfulness
Ichabod
regretlessness
whoops-a-daisy
F
whoopsie-daisy
contritely
ruefully
bemoan
live to regret
deplore
pity
bewail
lament
forgetfully
repent
regretter
afterthink
prick
tristfully
desire
apologetic
apology
pang of conscience
regret
repentance
sorrily
sorry
resentfully
vengefully
ah me
misspellingly
vindictively
revengefully
sorriness
if only
afraid
remorseful
semiapologetic
rejectfully
poor
complainingly
regretting
rue the day
pityingly
chastisement
ruefulness
alack and alas
correction
just saying
chastening
repathologize
distemperedly
thinko
misfortunately
penitent
belatedly
repentant
misengender
for shame's sake
invidiously
God be with the days
ashamedly
not to put too fine a point on it