Etymology
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alas (interj.)

mid-13c., from Old French ha, las (later French hélas), from ha "ah" + las "unfortunate," originally "tired, weary," from Latin lassus "weary" (from PIE root *‌‌lē- "to let go, slacken"). At first an expression of weariness rather than woe.

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Definitions of alas

alas (adv.)
by bad luck;
alas, I cannot stay
Synonyms: unfortunately / unluckily / regrettably
From wordnet.princeton.edu