apology
self-reproach
compunction
remorse
guilt
ruesome
regretful
regretter
F
apologize
wear sackcloth and ashes
aiyo
whip the cat
regrettable
regrettingly
too bad
guilty conscience
regretfully
regrettableness
comforter
bewail
sympathiser
sympathizer
bemoan
deplore
lament
pang of conscience
could have, would have, should have
ochanee
penitent
repentant
may the odds be ever in your favor
regret
repine
guilt trip
guilt feelings
live to regret
sorry
seem like a good idea at the time
repent
afraid
repentance
regretting
rue the day
what has someone done
shock
stupor
mischance
daze
mishap
regrettably
attrite
misadventure
regretfulness
regretlessness
luckless
unlucky
cover for
explain
Schadenfreude
chastening
correction
sorry for oneself
shit happens
life happens
troublingly
chastisement
self-despair
pity party
exculpatory
upsettal
sayang
shame
ill
life's a bitch and then you die
woe betide
sad panda
guilt complex
self-flagellation
sorriness
wouldn't you know it
miss
guilt pang
fear
what a shame
annoyance
what a pity
doryphore
kick
Ichabod
may the Force not be with you