The Collaborative International Dictionary of English v.0.48:

Spotless \Spot"less\, a.
   Without a spot; especially, free from reproach or impurity;
   pure; untainted; innocent; as, a spotless mind; spotless
   behavior.
   [1913 Webster]

         A spotless virgin, and a faultless wife. --Waller.
   [1913 Webster]

   Syn: Blameless; unspotted; unblemished; pure; immaculate;
        irreproachable. See Blameless.
        [1913 Webster] -- Spot"less*ly, adv. --
        Spot"less*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

spotlessness
    n 1: the state of being spotlessly clean [syn: spotlessness,
         immaculateness]