The Collaborative International Dictionary of English v.0.48:

Luckless \Luck"less\, a.
   Being without luck; unpropitious; unfortunate; unlucky;
   meeting with ill success or bad fortune; as, a luckless
   gamester; a luckless maid.
   [1913 Webster]

         Prayers made and granted in a luckless hour. --Dryden.
   -- Luck"less*ly, adv. -- Lock"less*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

luckless
    adj 1: having or bringing misfortune; "Friday the 13th is an
           unlucky date" [syn: unlucky, luckless] [ant: lucky]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "luckless":
   badly off, depressed, dire, donsie, doomful, evil-starred, fatal,
   fortuneless, funest, hapless, ill off, ill-fated, ill-starred,
   in adverse circumstances, inauspicious, miserable, ominous,
   out of luck, planet-struck, sad, short of luck, star-crossed,
   unblessed, underprivileged, unfortunate, unhappy, unlucky,
   unprosperous, unprovidential, untoward, wretched