A person who is "cool" displays confidence and a calm, unflappable demeanor. Whether "cool" people are actually popular or not, their bearing suggests that they are, and they
…are always in good spirits. They are constantly involved with the activities and people around them, and they are seldom upset or angered. They are not apathetic toward problems, but deal with them as best they can. Nearly everyone knows someone they consider cool, and it is possible to learn from those who are acknowledged as cool - not by copying them but by observing their actions, and how others react to them. (MORE) 
