Gnomish
arc
adjective. fierce, harsh, ill tempered; awkward, difficult
thlim quing ilon
collective name. *Folk of the Heavenly Arc
gruim
adjective. fierce
grum
adjective. fierce
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
Name for the people of Egalmoth in an early name list (PE13/104), a combination of thlim “race”, cwing “bow” [arc] and ilon “sky”, with quing ilon “sky bow” = “rainbow” as in Cris a Teld Quing Ilon “Gully of the Rainbow Roof”. Egalmoth’s people were called the “they of the Heavenly Arc” on LT2/173.