Nevbosh
From Tolkien Gateway
Nevbosh (New Non Sense) is a language created in 1910s by J.R.R. Tolkien and his cousin Mary Incledon (1895-1940).
According to Humphrey Carpenter, Tolkien and Mary "collaborated to invent [this] new and more sophisticated language".[1] However, Tolkien himself told that his role in the construction of Nevbosh was more humble; he merely contributed to the vocabulary and influenced the spelling.
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