From The Collaborative International Dictionary of English v.0.48 [gcide]:
Unluckily \Un*luck"i*ly\, adv.
In an unlucky manner.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
unluckily
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]