inhibited

CIDE DICTIONARY

inhibited, adj. 

•  held back or restrained or prevented; as, in certain conditions previously inhibited conditioned reactions can reappear; -- of behaviors. Opposite of uninhibited.  [WordNet 1.5]
•  Having a hesitancy or reluctance to exhibit normal emotional reactions; -- of people; as, he was too inhibited to make friends easily.  [PJC]

THESAURUS

inhibited

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