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!

Qenya 

yuyal(de)

adverb. in both ways

A correlative combination in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 appearing as ᴹQ. yuyal(de) “in both ways” (PE23/111), a combination of ᴹQ. yúya “both” and ᴹQ. -l(de) “ways”.

Neo-Quenya: For purposes of Neo-Quenya I would update this to ᴺQ. yuyallë “in both ways” using the later suffix -llë.