Sindarin
ero
adverb. *only, alone
i glinn hen agorer edain mi velerian, ach hí in ellath îr ed epholar
*this song Men made in Beleriand, but now the Elves alone (?remember) it
ero
adverb. *only, alone
i glinn hen agorer edain mi velerian, ach hí in ellath îr ed epholar
*this song Men made in Beleriand, but now the Elves alone (?remember) it
The Gnomish Lexicon of the 1910s had G. erw “only” as an adverbial form of G. er “one” (GL/33). A similar adverb ero appeared in the Túrin Wrapper from the late 1950s or early 1950s in the phrase ach in ellath hí ero ed epholar (VT50/5), untranslated but probably meaning something like “but now the Elves alone (?remember) it” as suggested by Carl Hostetter (VT50/15). The first version of this phrase had eno instead [perhaps meaning “✱still”], and the third version had îr.
There was another note probably from the late 1950s that derived îr from adjectival ✶eryā, but this phonetic development is abnormal since it seems to assume i-affection occurred after the loss of final vowels rather than before: eryā > erı̯a > erı̯ > irı̯ > îr (VT50/18). See also S. air “lonely” from the early 1960s which has the expected phonetic development from primitive ✶eryā.
Neo-Sindarin: For purposes of Neo-Sindarin, I would use ero “only, alone” as the best of the available options for the adverbial forms. For the adjective I would use S. air “lonely”.