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