An adjective appearing as G. uivrin “barren” in the Gnomish Lexicon of the 1910s glossed, the negated form of G. ivrin “fertile” (GL/46, 74). It had a variant form G. gwivrin “barren” where with the “ui- being replaced by analogy” (GL/46).
Neo-Sindarin: I would update this word to ᴺS. aliavren “barren” for purposes of Neo-Sindarin, based on the updated word ᴺS. iavren “fertile”.
A word for “barren” in the Gnomish Lexicon of the 1910s, a combination of G. giol “fecund” with the negative prefix G. il- (GL/50).