regretlessness
live to regret
no such luck
regrettingly
too bad
regrettable
sayang
guilt
fear
ruesome
remorse
compunction
self-reproach
shame
desire
lament
deplore
bemoan
bewail
whip the cat
regretfully
could have, would have, should have
grudgelessness
regretfulness
seem like a good idea at the time
pity
regretful
regretting
regret
remorselessness
regrettableness
unremembrance
regretter
eat one's words
afraid
repine
nostophobia
nonrenunciation
apologize
unremembering
amnesia
amnesty
disremember
unforget
apology
if only
misremembering
nonguilt
lamentably
forgettability