The Collaborative International Dictionary of English v.0.48:

Shyness \Shy"ness\, n.
   The quality or state of being shy. [Written also shiness.]
   [1913 Webster]

         Frequency in heavenly contemplation is particularly
         important to prevent a shyness bewtween God and thy
         soul.                                    --Baxter.
   [1913 Webster]

   Syn: Bashfulness; reserve; coyness; timidity; diffidence. See
        Bashfulness.
        [1913 Webster]

WordNet (r) 3.0 (2006):

shyness
    n 1: a feeling of fear of embarrassment

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "shyness":
   afraidness, bashfulness, boggle, boggling, compunction, confusion,
   coyness, demur, demureness, demurity, demurral, diffidence,
   embarrassment, falter, faltering, fearfulness, hesitance,
   hesitancy, hesitation, jumpiness, modesty, mousiness, objection,
   pause, protest, qualm, qualm of conscience, qualmishness, recoil,
   scruple, scrupulosity, scrupulousness, self-consciousness,
   shamefacedness, shamefastness, shrinking, shrinkingness,
   skittishness, stage fright, stagefright, stammering, startlishness,
   stickling, timidity, timidness, timorousness