Extrovert + Introvert = Ambivert
As a follow up to my Extrovert vs. Introvert post.

Some people have troubles with clearly defining themselves as either an introvert or an extrovert, which is understandable because these extremes are quite often portrayed as the only two alternatives with nothing in between which contrdicts with humans’ fluid and very complex nature. Thus it is entirely not unusual when someone cannot completely identify as either this or that, so for those who possess qualities of both introverts and extroverts the term ambivert has been established.
Ambiverts generally enjoy having company and meeting up with people and interaction usually isn’t as draining for them as it would be for an extremely introverted person, whereas they relish in being on their own just as well and don’t seek the company of others as strongly or often as extroverted people.