An adjective for “dark, overcast” in the Qenya Lexicon of the 1910s under the early root ᴱ√LUVU (QL/57).
Early Quenya
lúrea
adjective. overcast, dark [of weather]
lúvin(a)
adjective. dark, overcast
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
ᴱQ. lūrea “dark, overcast” appeared in the Qenya Lexicon as an adjectival form of ᴱQ. lūre “dark weather” (QL/57); the same form was mentioned in the Poetic and Mythological Words of Eldarissa with the gloss “overcast, dark” (PME/57).
Neo-Quenya: I think this word might be salvaged as ᴺQ. lúrëa; see the entry on ᴺQ. lúrë for a possible revised etymology.