An adverbial form of ᴱQ. naika “stricken ill, sick” (PE16/75), hence meaning “✱sickly”. It appeared in the first version of the Oilima Markirya poem from around 1930 (MC/221).
Early Quenya
naika
noun. dagger
naika
adjective. stricken ill, sick
naiko
adverb. *sickly
noiko
adverb. *sickly
A word glossed “stricken ill, sick” in notes associated with drafts of the Oilima Markirya poem (PE16/75). It might be related to the early root ᴱ√NAẎA as suggested by the editors.