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®

spiritless
     adj 1: lacking ardor or vigor or energy; "a spiritless reply to
            criticism" [ant: {spirited}]
     2: lacking spirit; "it was a spiritless attempt"
     3: evidencing little spirit or courage; overly submissive or
        compliant; "compliant and anxious to suit his opinions of
        those of others"; "a fine fiery blast against meek
        conformity"- Orville Prescott; "she looked meek but had
        the heart of a lion"; "was submissive and subservient"
        [syn: {compliant}, {meek}]