alas

Etymology 1

From Middle English alas, from Old French a las (French hélas), from a (“ah”) + las, from Latin lassus (“weary”). Compare Dutch helaas, North Frisian ielas, West Frisian eilaas.

intj

1. Used to express sorrow, regret, compassion or grief.
   I wanted to catch the last bus home, but alas, I was ten minutes late and had to take a taxi instead.
   Helas I lamente the dull abuſyd brayne The enfatuate fantaſies the wytles wylfulnes c. 1521, John Skelton, Speke Parott

Etymology 2

From Yakut алаас (alaas).

noun

1. A type of depression which occurs in Yakutia, formed by the subsidence of permafrost.