An Gnomish adjective for “free” mentioned in passing in the Qenya Lexicon of the 1910s under the early root ᴱ√FAẎA (QL/37). It did not appear in the contemporaneous Gnomish Lexicon.
Gnomish
unt
noun. nothing
untha
adverb/adjective. no, none
unthos
noun. eighteen
unath
noun. nothing
botheb-
verb. to untie, undo, unloose
udrug
adjective. intractable, fierce, untamed
fegrin
adjective. free
forog
noun. enemy
ub
adjective. no, none
ug-
verb. negative verb
ungathos
noun. eighteen
A verb appearing as G. botheb- “undo, untie, unloose” in the Gnomish Lexicon of the 1910s, a combination of G. bod- “back” (also = “un-”) and G. heb- “bind” (GL/23).
Neo-Sindarin: Neither the prefix or the sense of the verb survived in Tolkien’s later writings, so I would using the neologism ᴺS. dannod- “to untie, undo, unloose” instead, a reversed form of the later verb [N.] nod- “to tie”.