reticent reticent /ˈrɛtɪsənt/

adjective

1. Reluctant to draw attention to yourself  ( reticent , retiring , self-effacing )
   reluctant to draw attention to yourself
   
2. Cool and formal in manner  ( reticent , unemotional , restrained )
   cool and formal in manner
   
3. Temperamentally disinclined to talk  ( reticent , untalkative )
   temperamentally disinclined to talk