This question is quite ambiguous. The vernacular languages differ from country to county, and if you want to find out which languages would not be used, just take any languages that are official but not commonly spoken by the population. However, you must be careful not to count languages such as Belarusian as one of these, as it is not commonly spoken in Belarus, but, when spoken, is not used exclusively by the upper or ruling classes.
A constructed language like Klingon or Esperanto would not typically be used in vernacular literature because they are not widely spoken or recognized as natural languages. vernacular literature usually refers to works written in widely spoken languages like English, Spanish, or Mandarin.
You call literature written in the spoken language of the people vernacular literature. It often reflects the everyday language and expressions used by a particular group or community, making it more accessible and relatable to a wider audience.
In medieval Europe, a vernacular language was any language used by the common people that was not Latin.
The vernacular language is the language of the country, the language spoken by 'ordinary people' (and acquired as their mother tongue). In much of Europe it also meant 'as opposed to Latin'. Vernacular literature in Europe is used for literature in the language of the country (again, by contrast with literature in a foreign language). So, in the Middle Ages, Middle High German literature was vernacular, for example. In England, the vernacular meant 'English as opposed to Latin and French'.
Latin
The vernacular is the language of ordinary people, the language of the country. In Europe, it has historically been used to denote languages like French, Spanish, German, English in contrast to Latin. (In England, it was additionally used to denote English in contrast to French). It can also mean chocolate in chinese Specifically, the standard native language of a country or locality. More loosely, it is used to mean the slang, argot or jargon of a particular group. More specifically, 'vernacular' is the street talk of a native language. English is a native language. "You made me angry." would be the English. "You pissed me off." would be the vernacular.
Vernacular means the common language spoken by people in any part of the world as differentiated from the formal language used by scholars.
Since the vernacular is used in Liturgies of the Catholic Church, the common language of the country would be used; so in the Ukraine; Ukrainian would be used for all of the Liturgies.
Because he knew the language, the visitor used the Navaho vernacular when he visited the reservation.
The Renaissance period was characterized by the revival of classical learning, art, and literature. The primary language used during this period was Latin for scholarly and religious texts, while Italian, French, and Spanish were common vernacular languages for literature and everyday communication.
Vernacular
During the Renaissance period, Latin was commonly used for scholarly and official purposes, while vernacular languages such as Italian, French, and English were used for literature and everyday communication. Additionally, Greek and Hebrew were important for religious and classical studies.
The language used in everyday speech in a country is known as its vernacular or colloquial language. It is the informal, everyday language spoken by the majority of the population as opposed to formal or literary language. Vernacular language can vary from region to region within a country and reflects the cultural norms and practices of its speakers.