— Andrew Richardson (@AndrewR_Design) April 9, 2013
None of the books I’ve read on introversion seem to use this word. I suspect it is because the study of personality and temperament is complicated. Of course all of this is on a sliding scale. I might be slightly more introverted than you, who are more introverted than you sister. But your sister might be more shy and you might be more outwardly emotional.
The term “ambivert” seems like a cop-out term for “somewhere in the middle” which everybody is. It might be harmful in that people will learn it and think “I’m that!” trying to pinpoint themselves rather than understand the spectrum.