regretful
regretfully
self-reproach
remorse
compunction
pang of conscience
ochanee
whip the cat
repentance
apology
my apologies
sorry
repine
regrettingly
compunctious
aiyo
guilt
wear sackcloth and ashes
regrettably
regrettableness
regrettable
bitter
sayang
ruefully
F
bad
alack and alas
deplore
lament
could have, would have, should have
bewail
regretlessness
bemoan
rue the day
ruesome
lamentably
too bad
fear
sackcloth and ashes
guilty conscience
miss
remorseful
afterthink
eat one's words
mourning
regretfulness
prick
live to regret
guilt pang
shame
disappointedness
ashamed
pity party
penitent
desire
repentant
disheartened
apologize
self-flagellation
remorsefully
afraid
repent
resentingly
guilt-ridden
blarg
bad taste in one's mouth
arg
guilt complex
for old times' sake
pity
cry in one's beer
rueful
seem like a good idea at the time
remorsefulness
repression
ruth
pathos
commiseration
regret
regretter
disappointed
roll back the years
sorrowfully
regretting
self-abasing
look back
bummer