The Collaborative International Dictionary of English v.0.48:

Bloodless \Blood"less\, a. [AS. bl[=o]dle['a]s.]
   1. Destitute of blood, or apparently so; as, bloodless
      cheeks; lifeless; dead.
      [1913 Webster]

            The bloodless carcass of my Hector sold. --Dryden.
      [1913 Webster]

   2. Not attended with shedding of blood, or slaughter; as, a
      bloodless victory. --Froude.
      [1913 Webster]

   3. Without spirit or activity.
      [1913 Webster]

            Thou bloodless remnant of that royal blood ! --Shak.
      [1913 Webster] -- Blood"less*ly, adv. --
      Blood"less*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bloodlessly
    adv 1: without bloodshed; in a bloodless manner; without
           shedding blood; "the coup disposed of the dictator
           bloodlessly" [ant: bloodily]