pent-up
repressed
smothered
stifled
strangled
suppressed
abashed
arrested
bridled
cold
constrained
controlled
curbed
embarrassed
guarded
in check
in leading strings
in remission
on leash
passionless
reserved
restrained
retarded
reticent
self-conscious
shy
slowed down
under control
under discipline
under restraint
undersexed
unresponsive
uptight