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
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
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.