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!

Gnomish

tinta-

verb. to dance

A noun glossed “dance” in the Gnomish Lexicon of the 1910s (GL/70), clearly based on the early root ᴱ√TṆTṆ (QL/93), probably with [[g|short syllabic [ṇ] becoming [in]]]. It had a past form {tinti >>} tanti showing the development of [[g|long syllabic [ṇ̄] to [an]]].

Gnomish [GL/69; GL/70] Group: Eldamo. Published by

galtha-

verb. to kindle

A verb in the Gnomish Lexicon of the 1910s given as {galta- >>} galtha- “kindle”, apparently a transitive or causative variant of G. gal- “shine (golden)” (GL/37).

laltha-

verb. to dance

A word appearing as G. laltha- “to dance” in the Gnomish Lexicon of the 1910s, a verb form of G. lalt “a dance” (GL/52).

Neo-Sindarin: For purposes of Neo-Sindarin, I would adapt this word as ᴺS. liltha- for better compatibility with the later root ᴹ√LILT “dance”.