guilt
live to regret
self-reproach
remorse
compunction
fear
wear sackcloth and ashes
apologize
regrettingly
regrettable
too bad
regretfully
shame
whip the cat
pity
apology
regretlessness
eat one's words
ruesome
rue the day
regret
repine
whoops-a-daisy
whoopsie-daisy
deplore
bewail
lament
bemoan
regretful
Ichabod
repentance
regretting
sorriness
F
regretfulness
sayang
could have, would have, should have
ochanee
no such luck
repent
regretter
afraid
desire
oops
correction
chastening
chastisement
satisfaction
if only
regrettableness
seem like a good idea at the time
alack and alas
reverse
sorry
misgave
misbecame
I'm afraid so
pang of conscience
prick
soz
misgrew
bobble
repentant
wrongdid
misbode
boo-boo
look back
boot one
re-experiencing
attrite
drop a bollock
put a foot wrong
goof up
err
wrongdoing
reliving
fluff one's lines
boob
goof
penitence
penance
wrongtook
outgave
misbefell
guilt-ridden
see
wanweird
misfell
guilty conscience
attrition
sorry for oneself
lamentably
misremembering
put behind one
mess-up