ambivert

1. (psychology) A person who is neither clearly extroverted nor introverted, but has characteristics of each.Examples: "Many there are, as I have already shown, whose life can not be readily described by either the definitions of extroversion or introversion. [...] It is these I have called ambiverts. With them, extroversion or introversion are but passing states of mind, whereas with the extrovert extroversion is the dominant condition and with the introvert introversion is the dominant condition."; "[‘]We are not in the same class, in more ways than one’ (laughing), ‘she's a little genius, I'm a plain American ambivert, but we are enrolled in the same Advanced French group [...].’"; "Whenever parents are successful in this process of building a balanced personality from an introvert or an extrovert, we call the finished product an ambivert. An ambivert can move into a social situation and be a hearty, outgoing, gregarious participant. Or he can pick up a book and start the mental processes going like a regular introvert."