A person who is an outsider, often in a social or academic context.

बाहरी व्यक्ति

English Usage: The outler felt uncomfortable at the party where everyone else seemed to know each other.

Hindi Usage: उस बाहरी व्यक्ति को पार्टी में असहजता महसूस हुई जहां बाकी सभी एक-दूसरे को जानते थे।