adjective, unluckier, unluckiest.
(of a person) not lucky; lacking good fortune; ill-fated.
(of an event or circumstance) inauspicious or characterized by misfortune; ominous.

1520–30; un-1 + lucky

unluckily, adverb
unluckiness, noun

hapless, unsuccessful, unfortunate, ill-omened.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unlucky (ʌnˈlʌkɪ)
1.  characterized by misfortune or failure: an unlucky person; an unlucky chance
2.  ill-omened; inauspicious: an unlucky date
3.  regrettable; disappointing
4.  dialect (Brit) causing trouble; mischievous

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1530, "marked by misfortune or failure," from un- (1) "not" + lucky (see luck). Cf. W.Fris. unlokkich, M.L.G. unluckich. Sense of "boding ill" is recorded from 1547; that of "having bad luck" is from 1552; that of "bringing bad luck" is from 1586.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But they were unlucky enough to appear in their particular time and space.
Owls have even been known to prey upon unlucky cats and dogs.
Prisoners unlucky enough to be caught were punished severely.
Some of the largest have pitchers up to a foot deep and can consume a whole
  frog or even a rat unlucky enough to fall into them.
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