What does it mean when someone is said to have an “intense personality” or is an “intense person”?

Does it convey:
type A personality? goal-driven?
over-analyzing?
being a literal kind of person?
failing to read between the lines?
being inflexible? maladjusted?
inability to relax or be silly?

What’s the range? Do you personally know anybody “intense”?

Topics: relationships, psychology, people, conversation, behavior, personality, character