Home of Ungweliante (Ungoliant) in the Qenya Lexicon and Poetic and Mythological Words of Eldarissa from the 1910s (QL/80; PME/81), a combination of rua “still” with móre “night”.
Early Quenya
rua
adjective. steady, still, tranquil
ruamóre
place name. *Still Night
rúva
adjective. steady, still, tranquil
An adjective appearing as ᴱQ. rua or rūva “steady, still, tranquil” in the Qenya Lexicon of the 1910s under the early root ᴱ√RU’U (QL/80).
Neo-Quenya: For purposes of Neo-Quenya, I would retain ᴺQ. rua “steady, still, tranquil” as a derivative of a Neo-Root ᴺ√RUH.