A root in The Etymologies of the 1930s glossed “steep” with derivatives like Ilk. thall “steep, falling steeply (of river)” and Ilk. thalos “torrent”, the latter used for the river name Ilk. Thalos (Ety/STAL). Tolkien continued to use the name S. Thalos in later versions of The Silmarillion, but the name was translated nowhere else, making its continued connection to the 1930s root uncertain.
Middle Primitive Elvish
il
root. all
ilpirin
adjective. immortal
gilya
noun. star
slaiwā
adjective. sickly, sick, ill
sliw
root. sickly
stal
root. steep
ʒel
root. sky
A root in The Etymologies of the 1930s glossed “sky”, with derivatives like ᴹQ. helle/N. ell “sky” and ᴹQ. helwa/N. elw “(pale) blue” (Ety/ƷEL). It was the basis for the initial elements of the names N. Elrond, N. Elwing and ᴹQ. Elwe, but elsewhere Tolkien connected these names to √EL “star”. It was also an element in the word N. eilian(w) “rainbow, (lit.) sky-bridge”, later given as S. ninniach. On the basis of these changes, I think it is likely Tolkien abandoned ᴹ√ƷEL, but some of its derived words are still popular in Neo-Eldarin.
gengwa
root. sick
A root in The Etymologies of the 1930s glossed “sick” with derivatives ᴹQ. engwa/N. gem “sickly” (Ety/GENG-WĀ). It was given as ᴹ√GENG-WĀ, and thus represented an extension of an otherwise unattested root ᴹ√GENG. In the entry for ᴹ√YEN from The Etymologies it appeared as ᴹ√GEM in the discussion of N. ingem “old, (lit.) year-sick” (EtyAC/YEN), but I believe this represents the Noldorin phonetic developments of the true primitive form rather than a conceptual variation. The continued appearance of Q. Engwar in The Silmarillion narratives of the 1950s and 60s hints that this root may have remained valid as well.
ar
root. day
A root in The Etymologies of the 1930s glossed “day” with various derivatives like ᴹQ. are, N. aur “day” and ᴹQ. arin “morning” (Ety/AR¹). In Tolkien’s later writings, the Quenya word for “day” became aurë (RC/727; S/190), and in 1957 Quenya Notes he devised a new etymology for these day-words from the root √UR “heat” as in ✶auri “heat, period of sun” (PE17/148). That opens the question whether the various 1930s Quenya “morning” words from ᴹ√AR remain valid, but many Neo-Quenya writers (including me) retain them since there aren’t really any good alternatives. They might be salvageable as derivatives of the later root √AS “warmth” (so that “day” = “hot” and “morning” = “warm”).
glindi
root. pale blue
A rejected root in The Etymologies of the 1930s for “pale blue” used in an abandoned explanation of N. Eredlindon as “Blue Mountains” (Ety/GLINDI; EtyAC/GLINDI). Later this name was S. Ered Lindon “Mountains of Lindon” (Ety/LIN²; S/123).
gū
root. no, not
kwen(ed)
root. Elf
kwenedē
noun. Elf
lugni
adjective. blue
win(i)d
root. pale blue
A rejected with roots with derivatives having to do with “blue-grey” and “fading” (Ety/WIN), perhaps replacing another rejected root ᴹ√GWINDI (EtyAC/GWINDI).
ari
noun. day
eʒ-
verb. to be
geiā
adverb. ever
glisi
noun. honey
gū̆-
interjection. no, not
khe
pronoun. they
khōn
noun. heart
lis
root. honey
nem-
verb. to seem
sangā
noun. throng
slīwē
noun. sickness
sī̆/sē̆
pronoun. she
windı̯ā
adjective. pale blue
wis
root. air
yē
root. to be
ē
root. to be
ī
root. to be
A root in The Etymologies of the 1930s glossed “sickly”, with derivatives like ᴹQ. laiwa/N. flaew “sickly, sick, ill” and ᴹQ. líve/N. fliw “sickness” (Ety/SLIW). The root was first written as ᴹ√LIW (EtyAC/LIW). It is probably a later iteration of the unglossed root ᴱ√LEẆE from the Qenya Lexicon of the 1910s with derivatives ᴱQ. leuke “sick, ill; pallid, wan” and ᴱQ. leume “sickness” (QL/53).