A lot of only children are quiet; also, people who have phobias about how they look or are perceived by people.People who are clumsy, spastic, physically unfit, or can't keep up with a conversation they have no interest in. People who feel they don't fit into any group or clique, or people who just value their solitude. Honest people are mostly quiet, they don't hype up or exaggerate or lie to make themselves more entertaining. Many quiet people are introspective and intuitive, and are usually good listeners, as long as you don't bend their ear about trivialities that are irrelevant. They are also often lonely, because society values a big mouth and very talkative people.