Middle Primitive Elvish
abar
root. *refuser
abāro
noun. refuser, one who does not go forth
belē
noun. strength
tū
noun. strength
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
A “root” in The Etymologies from the 1930s that was an extension of ᴹ√AB “refuse, deny” (Ety/AB). It seems to just be ᴹ√AB(A) with the usual agental suffix -ro added. Its main derivative was Avari, a term that survived into Tolkien’s later writings as the name of the Elves that refused to go to Valinor.