An adjectival form of ᴱQ. limpalasse “much roaring” in the Qenya Lexicon of the 1910s given as limpa(pa)lasse(a) (QL/53), also mentioned (unglossed) in the Poetic and Mythological Words of Eldarissa as limpalasse(a) (PME/53).
Early Quenya
limpalasse
noun. much roaring
limpalassea
adjective. much roaring
limpa(pa)lasse(a)
adjective. much roaring
A noun in the Qenya Lexicon of the 1910s glossed “much roaring” (QL/53), a combination of ᴱQ. li(n)- “many” and ᴱQ. palasse “splashing”, so likely referring to the roar of waves on the beach.