fear
live to regret
bewail
bemoan
lament
deplore
shame
too bad
regrettable
sayang
guilt
ruesome
regretlessness
regret
remorse
compunction
regrettingly
self-reproach
rue the day
desire
whip the cat
regretfully
repine
apologize
wear sackcloth and ashes
regrettableness
pity
regretfulness
regretting
apology
repent
eat one's words
Ichabod
I'm afraid so
regretter
F
regretful
ochanee
no such luck
not want to do that
seem like a good idea at the time
lamentably
could have, would have, should have
whoopsie-daisy
whoops-a-daisy
penance
penitence
look back
repentance
sorry