In fact, he'd always been something of a secretive loner within the family, even though he was very much an extrovert with his friends, of which he had many, or at least used to.
"Syndrome"
Thomas Hoover
The extrovert is the typical active; always leaning out of the window and setting up contacts with the outside world.
"The Life of the Spirit and the Life of To-day"
Evelyn Underhill
In the realm of humour the extrovert is a success; what amuses him amuses the crowds.
"A Dominie in Doubt"
A. S. Neill