An adjective for “tall” in The Etymologies of the 1930s derived from primitive ᴹ✶tundā under the root ᴹ√TUN (Ety/TUN).
Qenya
halda
adjective. veiled, hidden, shadowed, shady
halda
adjective. tall
landa
adjective. wide, wide, [ᴱQ.] broad
tunda
adjective. tall
An adjective in The Etymologies of the 1930s glossed “veiled, hidden, shadowed, shady” derived from the primitive ᴹ✶skalnā based on the root ᴹ√SKAL “screen, hide (from light), overshadow” (Ety/SKAL¹). A similar form halda “hidden, veiled” appeared in the entry for a deleted root ᴹ√SKAL³ “cover, hide” (EtyAC/SKAL³), probably abandoned when Tolkien adjusted the meanings of the roots ᴹ√SKAL and ᴹ√SKEL; see those entries for details. This word might be consider an adjectival form of hala “cast shadow” from 1966-67 (PE17/154).