The Finno-Ugric language spoken by the majority of the people living in Finland, one of the two official languages of the country (the other is Swedish).
"During her trip to Helsinki, she practiced speaking Finnish so that locals could understand her better."
In plain English: A Finnish is someone who lives in Finland or speaks its language.
"My friend speaks fluent Finnish and loves to sing traditional folk songs."
of or relating to or characteristic of Finland or the people of Finland
"Finnish architecture"
Of or pertaining to Finland.
"The Finnish people have a rich tradition of celebrating their country's independence day."
In plain English: Finnish refers to anything related to Finland, its people, language, or culture.
"The Finnish design company created beautiful furniture with clean lines and functional shapes."
The word comes from Old English fenn, meaning Fenland, combined with the suffix -ish. It originally referred to people or things related to the marshy region of Fens in eastern England.