ninn

adjective. slender

The Etymologies of the 1930s had ninn as a cognate to ᴹQ. ninde “slender”, both derived from the root ᴹ√NIN-DI “fragile, thin” (Ety/NIN-DI).

Neo-Sindarin: I would adapt this word as ᴺS. nind as suggested in HSD (HSD), in keeping with the notion that “nd remained at the end of fully accented monosyllables” (LotR/1115).

Conceptual Development: Early Noldorin word-lists of the 1920s had ᴱN. minedh glossed “fine, slender” (PE13/150) or “thin, fine, small” (PE13/164), derived from primitive ᴱ✶miniyā.

ninn

adjective. slender

elw

adjective. (pale) blue

lhorn

noun. quiet water

lhorn

noun. anchorage, harbour

lhûn

adjective. (unknown meaning)

This word, which also appears on the map of Middle-earth in LotR, is glossed as "blue" in The Etymologies, but Tolkien later rejected this meaning (as luin was already used in that sense). He then proposed several explanations for it, including the possible adaptation of a Dwarvish name into Sindarin, but he apparently never reached a definitive solution.

lhûn

adjective. blue

nen

noun. water (used of a lake, pool or lesser river)

nen

noun. waterland

nen

noun. water