regrettingly
fear
guilt
regrettable
too bad
regret
live to regret
regretlessness
lament
deplore
bewail
bemoan
compunction
remorse
self-reproach
shame
ruesome
whip the cat
sayang
pity
regretfully
apology
regretfulness
regretful
ochanee
desire
regrettableness
regretter
eat one's words
Ichabod
repine
wear sackcloth and ashes
rue the day
apologize
alack and alas
could have, would have, should have
whoopsie-daisy
whoops-a-daisy
no such luck
sorriness
repent
afraid
outgave
regretting
aiyo
seem like a good idea at the time
resentable
poop
mean
disbecame