ashamed
modest
abashed
bashful
blushing
chagrined
chapfallen
chastened
confused
conscience-smitten
conscience-stricken
conscious
coy
crestfallen
crushed
demure
diffident
discomfited
embarrassed
full of remorse
hangdog
humbled
humiliated
inarticulate
meek
mortified
mousy
out of countenance
red-faced
regretful
remorseful
repining
rueful
self-accusing
self-condemning
self-conscious
self-convicting
self-debasing
self-effacing
self-flagellating
self-humiliating
self-punishing
self-reproaching
shamed
shamefast
shameful
sheepish
apologetic
bad-boy
bemused
cocky
contrite
deprecatory
disdainful
downcast
furtive
reproachful
vacuous
wistful