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 

o(na)nde

adverb. to exactly the same degree

The correlatives ᴹQ. onande or onde “to exactly the same degree” appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/108), a combination of ᴹQ. on- “same” and ᴹQ. -n(de) “degree”.

Neo-Quenya: For purposes of Neo-Quenya I would update this to ᴺQ. imandë “to exactly the same degree” using im- “same”.