a shy person.

Psychology . a person characterized by concern primarily with his or her own thoughts and feelings ( opposed to extrovert ).

Zoology . a part that is or can be introverted.

Psychology . marked by introversion.

to turn inward

to introvert one's anger.

Psychology . to direct (the mind, one's interest, etc.) partly to things within the self.

Anatomy, Zoology . to turn (a hollow, cylindrical structure) in on itself; invaginate.

noun

extrovert

noun

autist , brooder , egoist , egotist , loner * , narcissist , self-observer , solitary , wallflower , inward , loner