The Walloon language.

(historical) languages spoken by the Allied Powers and borrowed words in Japanese that originated from such languages

(linguistics) "role language": unique language usage serving as a marker of social identity in fictional speech

If one learns without thinking, one will be lost in his learning. That is, if one does not think about what one learns, he will not arrive at the truth of it.

Min Nan

Breton language

the Erzya language

the Faroese language

the Cornish language

Modern Greek - the Greek language as spoken since the 16th century