- reticent, untalkative - temperamentally disinclined to talk
Antonym: voluble (indirect, via taciturn)
- reserved, restrained, reticent, unemotional - cool and formal in manner
Antonym: demonstrative (indirect, via undemonstrative)
- reticent, self-effacing - reluctant to draw attention to yourself
Antonym: assertive (indirect, via unassertive)