Source : Webster's Revised Unabridged Dictionary (1913)

Blameless \Blame"less\, a.
   Free from blame; without fault; innocent; guiltless; --
   sometimes followed by of.

         A bishop then must be blameless.         --1 Tim. iii.
                                                  2.

         Blameless still of arts that polish to deprave.
                                                  --Mallet.

         We will be blameless of this thine oath. --Josh. ii.
                                                  17.

   Syn: Irreproachable; sinless; unblemished; inculpable.

   Usage: {Blameless}, {Spotless}, {Faultless}, {Stainless}. We
          speak of a thing as blameless when it is free from
          blame, or the just imputation of fault; as, a
          blameless life or character. The others are stronger.
          We speak of a thing as faultless, stainless, or
          spotless, only when we mean that it is absolutely
          without fault or blemish; as, a spotless or stainless
          reputation; a faultless course of conduct. The last
          three words apply only to the general character, while
          blameless may be used in reverence to particular
          points; as, in this transaction he was wholly
          blameless. We also apply faultless to personal
          appearance; as, a faultless figure; which can not be
          done in respect to any of the other words.

Source : WordNet®

blameless
     adj : free of guilt; not subject to blame; "has lived a blameless
           life"; "of irreproachable character"; "an unimpeachable
           reputation" [syn: {inculpable}, {irreproachable}, {unimpeachable}]