From WordNet (r) 3.0 (2006) [wn]:
unfortunately
adv 1: by bad luck; "unfortunately it rained all day"; "alas, I
cannot stay" [syn: unfortunately, unluckily,
regrettably, alas] [ant: as luck would have it,
fortuitously, fortunately, luckily]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Unfortunate \Un*for"tu*nate\, a.
Not fortunate; unsuccessful; not prosperous; unlucky;
attended with misfortune; unhappy; as, an unfortunate
adventure; an unfortunate man; an unfortunate commander;
unfortunate business. -- n. An unfortunate person. --Hood.
[1913 Webster] -- Un*for"tu*nate*ly, adv. --
Un*for"tu*nate*ness, n.
[1913 Webster]