A word for “slumbrous” in the Qenya Lexicon of the 1910s, an adjectival form of ᴱQ. murme “slumber” (QL/63).
Early Quenya
lorda
adjective. slumbrous, drowsy
murmea
adjective. slumbrous
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.
The adjective ᴱQ. lorda “slumbrous, drowsy” appeared in the Qenya Lexicon of the 1910s under the early root ᴱ√LORO “doze, slumber” (QL/56).
Neo-Quenya: I’d retain ᴺQ. lorda for purposes of Neo-Quenya since I retain the connection between √LOR and sleep; see the entry on √(O)LOR for further discussion.