Source : Webster's Revised Unabridged Dictionary (1913)

Spiritless \Spir"it*less\, a.
   1. Destitute of spirit; wanting animation; wanting
      cheerfulness; dejected; depressed.

   2. Destitute of vigor; wanting life, courage, or fire.

            A men so faint, so spiritless, So dull, so dead in
            lock, so woebegone.                   --Shak.

   3. Having no breath; extinct; dead. ``The spiritless body.''
      --Greenhill. -- {Spir"it*less*ly}, adv. --
      {Spir"it*less*ness}, n.

Source : WordNet®

spiritlessness
     n : the trait of lacking enthusiasm for or interest in things
         generally [syn: {apathy}, {indifference}]