bewail
bemoan
lament
deplore
remorse
compunction
self-reproach
too bad
regrettable
regret
regrettingly
guilt
apology
fear
rue the day
shame
wear sackcloth and ashes
live to regret
regretful
ruesome
regretlessness
whip the cat
bitter
apologize
aiyo
regrettableness
Ichabod
resentable
regretter
F
ochanee
pang of conscience
penitence
penance
regretfully
repentance
pity
grudge
stew
retroactive rape
could have, would have, should have
regretting
disbecame
sackcloth and ashes
desire
sayang
eat one's words
seem like a good idea at the time
shamed
regretfulness