Qenya
laiwa
adjective. sickly, sick, ill
luina
adjective. pale
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.
An adjective appearing as ᴹQ. laiwa “sickly, sick, ill” in The Etymologies of the 1930s derived from primitive ᴹ✶slaiwā under the root ᴹ√SLIW “sickly” (Ety/SLIW). The ancient initial sl became voiceless hl, which was then voiced to l as was generally the case in The Etymologies.
Neo-Quenya: In Tolkien’s later writing, he usually retained hl- in spelling if not pronunciation; see the entry on how initial voiceless nasals and liquids were voiced for discussion. As such, most Neo-Quenya writers adapt this word as ᴺQ. hlaiwa.
Conceptual Development: The Qenya Lexicon of the 1910s had the word ᴱQ. leuke (leuki-) “sick, ill; pallid, wan” under the similar but earlier root ᴱ√LEẆE (QL/53).