serbian
adj. B1 Intermediate US //ˈsɝbiən// ser·bian
adj. relating to Serbia, its people, or its language.
adj. originating from or characteristic of the country of Serbia.
She speaks fluent Serbian at home.
The museum displays traditional Serbian folk costumes from the nineteenth century.
The complex history of Serbian nationalism has profoundly shaped the political landscape of the Balkans.
From Serb + -ian or Serbia + -an.
Usage
When referring to the language, it is a proper noun and capitalized. As an adjective, it modifies nouns related to the country.