Gnomish
cuilog
adjective. alive, lively
cuib
adjective. alive
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.
A word appearing as G. cuilog “alive, lively” in the Gnomish Lexicon of the 1910s, an adjectival form of G. cuil “life” (GL/27). Tolkien specified that this word was “usually metaph[oric]”, so probably “lively” was a better translation than “alive”.
Neo-Sindarin: For purposes of Neo-Sindarin, I’d update this word to ᴺS. cuileb “lively” using the later adjective suffix -eb, but for “alive” I’d use [N.] cuin.