Etymology
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unfortunately (adv.)

1540s, "in an unfortunate manner, by ill-fortune," from unfortunate + -ly (2). The original meaning is now rare; the main modern sense of "sad to say, unhappily, unluckily," in parenthetical use, is recorded from 1770s.

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Definitions of unfortunately

unfortunately (adv.)
by bad luck;
unfortunately it rained all day
Synonyms: unluckily / regrettably / alas
From wordnet.princeton.edu