untaciturn

Example:Despite usually being taciturn, she felt compelled to speak up in this situation.

Definition:Disinclined to talk or speak freely; reserved in speech; reticent.

Example:The reticent old man was reluctant to discuss his past but allowed his friend to share a few stories.

Definition:Shy or hesitant in making advances to people; reserved, retiring, or shy in appearing to those whom one does not know.

Example:She was very reserved and careful to keep her opinions to herself most of the time.

Definition:Not obvious or obvious but used in such a way as to avoid offensive or embarrassing remarks; careful in exposing one's thoughts or oneself.