Quenya 

astalda

adjective. strong, *valiant

An adjective glossed “strong” and derived from the root √STAL in a page of notes having to do with “large & small” words, probably from the late 1960s (PE17/115). This page was rejected, but Tolkien used Astaldo “Valiant” as a sobriquet of Tulkas in later versions of The Silmarillion. As such, I would assume [ᴺQ.] astalda is valid for purposes of Neo-Quenya, but I would use it with the meaning “✱valiant” rather than “strong”.

astalda

adjective. *valiant; strong