1. 
[syn: unashamedly, shamelessly, barefacedly]
The Collaborative International Dictionary of English v.0.48:
Shameless \Shame"less\, a. [AS. scamle['a]s.]
   1. Destitute of shame; wanting modesty; brazen-faced;
      insensible to disgrace. "Such shameless bards we have."
      --Pope.
      [1913 Webster]
            Shame enough to shame thee, wert thou not shameless.
                                                  --Shak.
      [1913 Webster]
   2. Indicating want of modesty, or sensibility to disgrace;
      indecent; as, a shameless picture or poem.
      [1913 Webster]
   Syn: Impudent; unblushing; audacious; immodest; indecent;
        indelicate.
        [1913 Webster] -- Shame"less*ly, adv. --
        Shame"less*ness, n.
        [1913 Webster]
WordNet (r) 3.0 (2006):
shamelessly
    adv 1: without shame; "he unashamedly abandoned the project when
           he realized he would not gain from it" [syn:
           unashamedly, shamelessly, barefacedly] [ant:
           ashamedly]