The Collaborative International Dictionary of English v.0.48:

Bashfulness \Bash"ful*ness\, n.
   The quality of being bashful.
   [1913 Webster]

   Syn: Bashfulness, Modesty, Diffidence, Shyness.

   Usage: Modesty arises from a low estimate of ourselves;
          bashfulness is an abashment or agitation of the
          spirits at coming into contact with others; diffidence
          is produced by an undue degree of self-distrust;
          shyness usually arises from an excessive
          self-consciousness, and a painful impression that
          every one is looking at us. Modesty of deportment is
          becoming in all; bashfulness often gives rise to
          mistakes and blundering; diffidence in society
          frequently makes a man a burden to himself; shyness
          usually produces a reserve or distance which is often
          mistaken for haughtiness.
          [1913 Webster]

WordNet (r) 3.0 (2006):

bashfulness
    n 1: feeling embarrassed due to modesty [syn: abashment,
         bashfulness]