A word appearing as ᴱN. glidheb “like honey” in Early Noldorin Word-lists of the 1920s, an adjectival form of ᴱN. glí “honey” (PE13/144). The dh may have been introduced before the adjective suffix -eb to make it more pronounceable.

Neo-Sindarin: Since [N.] glî “honey” appeared in Tolkien’s later writings, I’d retain ᴺS. glidheb “like honey” for purposes of Neo-Sindarin.