argentinian
adj. A2 Elementary US //ˌɑɹdʒənˈtɪniən// ar·gen·tini·an
adj. relating to the country of Argentina or its people.
adj. relating to the South American nation of Argentina or its inhabitants. Typically used attributively to modify nouns or predicatively after a linking verb.
I love eating Argentinian food.
The museum is hosting an exhibition of Argentinian art from the twentieth century.
The Argentinian delegation arrived early to the summit to discuss regional trade agreements with their neighbours.
From Argentin(a) + -ian.
Usage
Typically capitalised. While it can function as a noun to describe a person, the adjectival use is more frequent in general contexts.