tuđinac

1. formal stranger; foreigner
   U rodnom gradu se osećao kao tuđinac. — He felt like a stranger in his hometown.
   Zemlja je vekovima bila pod vlašću tuđinaca. — For centuries the country was ruled by foreigners.

In everyday speech the ordinary word is stranac. Tuđin also sounds literary and, like tuđinac, emphasizes foreignness or estrangement.