regrettable
too bad
ruesome
fear
regrettingly
lament
bemoan
bewail
deplore
live to regret
guilt
pity
remorse
self-reproach
compunction
apology
shame
regretlessness
regrettableness
regret
regretfully
whip the cat
regretter
sayang
rue the day
regretting
apologize
regretfulness
repine
repent
lamenting
regretful
ochanee
wear sackcloth and ashes
lamentably
desire
I'm afraid so
Ichabod
sorriness
unhappily
misgave
could have, would have, should have
mean
no such luck
overgave
penitence
penance
prick
seem like a good idea at the time
repentance