The four basic temperaments or "humors" were developed by the ancient Greek physician Hippocrates as a medical theory to describe aspects of a personality. A personality, as a whole, is too unique and complex to fit into a four quadrant box. A temperament is a piece of the personality; it is the fundamental, innate nexus of an individual.
I had a person whom I thought was my best friend. Then she turned on me like an evil fury- with such hateful aggression and lies to others, when in fact, I had been keeping her evil secrets.... I will never be able to explain it or fully understand it. M**y D*****a, you are a scary and evil woman. It's difficult to form new close friendships now, because of her.