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!
Gnomish
caithos
noun.causation
A word appearing as G. caithos “causation” in the Gnomish Lexicon of the 1910s based on G. caith “cause, reason, motive” (GL/24).
Neo-Sindarin: For purposes of Neo-Sindarin, I would update this to ᴺS. caethas “causation” based on ᴺS. caeth “cause, reason, motive” as an updated form of G. caith.
A word appearing as G. caithos “causation” in the Gnomish Lexicon of the 1910s based on G. caith “cause, reason, motive” (GL/24).
Neo-Sindarin: For purposes of Neo-Sindarin, I would update this to ᴺS. caethas “causation” based on ᴺS. caeth “cause, reason, motive” as an updated form of G. caith.