√DEL³ root. “thick, dense”
A rejected root meaning “thick, dense” that appeared in rough etymological notes for the name of S. Glorfindel < glaur-phin-dela = “gold-hair-thick” (PE17/17). One of the proposed Quenya forms was nelya beside lelya, indicating Tolkien was considering strengthening the root form to √NDEL. For purposes of Neo-Eldarin, I think it would be worth salvaging this root in this strengthened form, since I know of no other good option for words meaning “dense”.
References ✧ PE17/17, 151