A root in The Etymologies of the 1930s glossed “stay, stick, adhere, remain, tarry”, with variants ᴹ√LEB and ᴹ√LEM (Ety/LEM), but some of its derivatives can only plausibly be derived from ᴹ√LEM: ᴹQ. lemya- “to remain, tarry” (EtyAC/LEB). Its most notable derivative was Q. Lembi “Lingerers”, but Tolkien’s seems to have abandoned this word and the root may have been abandoned with it. It nevertheless remains useful for the purposes of Neo-Eldarin.
Middle Primitive Elvish
ad
root. entrance, gate
adnō
noun. gate
(n)der
root. adult male, man; bridegroom
-ina
suffix. adjective
khim
root. adhere, stick, cleave [to]
-nā
suffix. adjective
-ya
suffix. adjectival suffix
der
root. adult male, man
lem
root. stay, stick, adhere, remain, tarry
leb
root. stay, stick, adhere, remain, tarry
ata
root. father
atar
noun. father
dēr
noun. man
nis
root. woman
nī
noun. woman
atū
noun. father
galā-
verb. to grow
golā-
verb. to grow
ndeuna
adjective. second
ndūne
noun. west
nī̆s
noun. woman
winyē
noun. evening
yatta
preposition. across
yan
root. give
A root in The Etymologies of the 1930s glossed “give” with derivatives ON. yanta- “give” and ᴹQ. Ariante “Day-bringer” (EtyAC/YAN²). Tolkien marked this entry with a “?”, and elsewhere in The Etymologies he derived ᴹQ. anta-/N. anna- “give” from ᴹ√ANA (Ety/ANA¹), so I suspect this root was a transient idea.
A root in The Etymologies of the 1930s glossed “gate, entrance” (Ety/AD) that seems to have replaced ᴱ√BOÐO (QL/75) from the Qenya Lexicon of the 1910s. Its two main derivatives are ᴹQ. ando and N. annon “(great) gate, door”. These words in turn were transferred in 1959 to the root √ANA “to, towards”, from the original “approach, entrance” (PE17/40). Thus it seems Tolkien abandoned this root, perhaps because he wished to use it instead for √AD(A) “alongside, by the side of”, one of the etymologies Tolkien considered for the Eldarin words for “and” (PE17/71).