The Collaborative International Dictionary of English v.0.48:

Effrontery \Ef*front"er*y\, n.; pl. Effronteries. [F.
   effronterie, fr. effront['e] shameless, fr. L. effrons,
   -ontis, putting forth the forehead, i. e., barefaced,
   shameless; ex + frons the forehead. See Front.]
   Impudence or boldness in confronting or in transgressing the
   bounds of duty or decorum; insulting presumptuousness;
   shameless boldness; barefaced assurance.
   [1913 Webster]

         Corruption lost nothing of its effrontery. --Bancroft.

   Syn: Impudence; sauciness. See Impudence.
        [1913 Webster]