This is for the Latin experts of the dope. Extroverted/extraverted and introverted are from the writings of Carl Gustav Jung. Extrovert is much more used than extraverted. It definitely seems like extroverted is used by the general public, and extraverted only by orthodox jungians (warning, PDF).
I recall I read some time very long ago somebody (a jungian no doubt) wrote that extraverted is the correct term, because it is a jungian term and Jung said extraverted is correct. There was a letter from an American jungian he or she referred to, where Jung was asked which was correct, and his secretary wrote back to the American (something like): “Dr Jung says it should be extraverted, because extrovert is bad latin.”
Of course Jung knew latin very well, being a doctor from the time doctors knew latin and reading latin alchemical texts like the rest of us are reading Dan Brown if nothing else, but since extraverted never caught on, I need to take this to the Latin lovers of the dope.
Is, in fact, extrovert bad latin?