Ala-

From Tolkien Gateway

ala- is a Quenya prefix meaning "not-, un-". Seen in alahasta "unmarried".[1] This prefix seems to have the power to turn a following verbal stem into a past participle even if no explicit participle ending is present. Unlike ú-, this prefix does not seem to have negative connotations.

References

  1. J.R.R. Tolkien, Christopher Tolkien (ed.), Morgoth's Ring, "Part Three. The Later Quenta Silmarillion: (II) The Second Phase: Later versions of the Story of Finwë and Míriel", p. 254