Gnomish
caithonwed
adjective. original
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
caithonwed
adjective. original
A word appearing as G. caithonwed “original” in the Gnomish Lexicon of the 1910s, an adjective related to G. caithos “causation” and G. caith “cause, reason, motive” (GL/24).
Neo-Sindarin: For purposes of Neo-Sindarin, I would update this to ᴺS. caetheb “original” based on ᴺS. caeth “cause, reason, motive” as an updated form of G. caith.