Qenya
semellume
adverb. *a few times, *a few times, seldom
sempallume
adverb. *a few times
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!
The correlative combinations semellume or sempallume appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/110), a combination of ᴹQ. sem(p)- “few” and ᴹQ. -llume “time(s)”.
Neo-Quenya: For purposes of Neo-Quenya I would also use semellume to mean “seldom” to replace (probably abandoned) seman(an).