outsider

noun

• 1a person who does not belong to a particular organization or profession: to the outsider, glitzy fashion shows may seem an outrageous extravagance
• a person who is not accepted by or who isolates themselves from society: she felt that his friends despised her as an outsider

• 2a competitor, applicant, etc. thought to have little chance of success:the winner was Beech Road, a fifty-to-one outsider he started as a rank outsider