Loner

A loner is a person who avoids or does not actively seek human interaction or prefers to be alone. There are many reasons for solitude, intentional or otherwise, and "loner" does not imply a specific cause. Intentional reasons include spiritual and religious considerations or personal philosophies. Unintentional reasons involve temperament, being highly sensitive, having more extreme forms of shyness, or various mental disorders. The modern term "loner" can be used with a negative connotation in the belief that human beings are social creatures and those that do not participate are deviant.