The Collaborative International Dictionary of English v.0.48:

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]

WordNet (r) 3.0 (2006):

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]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "unfortunately":
   by ill hap, by ill luck, impolitically, impoliticly,
   in adverse circumstances, inadvisably, inappropriately, inaptly,
   inauspiciously, incongruously, inconveniently, ineptly,
   inexpediently, infelicitously, inopportunely, sadly, undesirably,
   unfavorably, unfittingly, unhappily, unluckily, unpromisingly,
   unpropitiously, unprovidentially, unseasonably, unsuitably