A word for “abyss” in the Markirya poem of the 1960s (MC/222), perhaps based on the root √NDU “down”.
Quenya
undumë
abyss
undumë
noun. abyss
undumë hácala
the abyss yawning
undumë rúma
the abyss moving
The twenty-second line of the Markirya poem (MC/222). The first word is undumë “abyss” followed the infinitive (or short active-participle) form of rum- or rúma- “to move”, used adjectivally.
Decomposition: Broken into its constituent elements, this phrase would be:
> undumë rúma = “✱abyss moving”
Conceptual Development: In the first draft, Tolkien used an ordinary active-participle form rúmala, which he retained initially in the second draft before changing it into the shorter form rúma (MC/222).
mandu
abyss
mandu noun "abyss" (MC:214; this is "Qenya" - Tolkien's later Quenya has undumë)
undumë noun "abyss" (Markirya)