No language indication in the Etymologies, but Noldorin from context and phonological evidence
Noldorin
nûr
adjective. deep
nûr
adjective. deep
nûr
noun. race
nûr
noun. race
dem
adjective. sad, gloomy
noer
adjective. sad, lamentable
path
adjective. smooth
path
adjective. smooth
tû
noun. muscle, sinew, vigour, physical strength
An adjective for “deep” in The Etymologies of the 1930s derived from ᴹ✶nūrā under the root ᴹ√NUR of the same meaning (Ety/NUR).