shame
pity
fear
live to regret
guilt
regrettingly
remorse
compunction
self-reproach
ruesome
desire
regretlessness
regretfully
regretter
apologize
regret
lament
deplore
bemoan
bewail
wear sackcloth and ashes
regrettable
too bad
regretting
sayang
lamentably
eat one's words
Ichabod
F
sorryish
whip the cat
rue the day
regrettableness
repent
regretful
no such luck
seem like a good idea at the time
regretfulness
I'm afraid so
if only
whoops-a-daisy
whoopsie-daisy
mean
regrettably
may the Force not be with you
dredge up
apology
drag up
alack and alas
prick
repine
put behind one
rake over
send back
lang syne
nostalgize
good old days
nostalgia
auld langsyne
old times
langsyne
God be with the days
tumble on
reminder
retrospection
misremembrance
lamenting
could have, would have, should have
ochanee
adios
let something slip
botch
arrivederci
bye
good-by
boner
bloomer
cheerio
re-experiencing
bungle
foul-up
bye-bye
auf wiedersehen
blooper
fuckup
boo-boo
amnesia
adieu
semiapologetic
au revoir
reliving
pratfall
afraid
flub
look back
blunder