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.
imman(an)
adverb. ever, at any time
imman(de)
adverb. ever, at all, to any degree
The correlative ᴹQ. imman or immande “ever, at all, to any degree” appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/111), a combination of ᴹQ. imma “any” and ᴹQ. -n(de) “degree”.
Neo-Quenya: Since ᴹQ. imma “any” too closely resembles the later prefix Q. im- “same”, for purposes of Neo-Quenya I would update this to ᴺQ. aiandë “ever, at all, to any degree” using the hypothetical prefix ᴺQ. ai(a)- “any”; see that entry for discussion.
aian imman
at any other time
qáqen imman
continually, constantly, repeatedly throughout a given period
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.
The correlatives ᴹQ. imman or immanan “ever, at any time” appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/109), a combination of ᴹQ. imma “any” and ᴹQ. -n(an) “time”.