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

thasc

adjective. shaven

An adjective appearing as G. {thathra >>} thasc “shaven” in the Gnomish Lexicon of the 1910s, an adjectival form of G. thas- “shave” (GL/72).

Neo-Sindarin: I would adapt this word as ᴺS. thasg “shaven” for purposes of Neo-Sindarin, since sc usually became sg in Sindarin of the 1950s and 60s.