lacking confidence in one's own ability, worth, or fitness; timid; shy.

restrained or reserved in manner, conduct, etc.

Archaic . distrustful.

adjective

bold , confident

adjective

backward , bashful , blenching , chary , constrained , coy , demure , distrustful , doubtful , dubious , flinching , humble , insecure , meek , modest , mousy , rabbity , reluctant , reserved , retiring , self-conscious , self-effacing , sheepish , shrinking , shy , suspicious , timid , timorous , unassertive , unassuming , unassured , unobtrusive , unpoised , unsure , withdrawn