The Qenya Lexicon of the 1910s had several similar adjectives under the early root ᴱ√QOLO: ᴱQ. qolda or qolina “ill” and ᴱQ. qolima “sickly, ailing” (QL/78).

Neo-Quenya: I’d adopt ᴺQ. quolina for all these meanings: “ill, sickly, ailing”. I would further assume it applies to any kind of physical ailment, including injury. For someone sick specifically by disease I would use [ᴺQ.] hlaiwa. Not all Neo-Quenya writers accept quo- as a valid combination; see the entry on how [wo] became [o] for further discussion.