regret
lament
bewail
deplore
bemoan
fear
guilt
regrettingly
shame
alack and alas
sayang
regrettable
compunction
remorse
too bad
self-reproach
wear sackcloth and ashes
regretfully
aiyo
live to regret
eat one's words
apology
ochanee
regretlessness
rue the day
ruesome
repent
repine
whip the cat
could have, would have, should have
regretter
regretfulness
F
regretful
disappointed
regretting
desire
apologize
lamentably
bitter
regrettableness
sorriness
resignation
surrender
seem like a good idea at the time
badly
remorseful
sorry
apologetic
retroactive rape