Source : Webster's Revised Unabridged Dictionary (1913)

Prettiness \Pret"ti*ness\, n.
   The quality or state of being pretty; -- used sometimes in a
   disparaging sense.

         A style . . . without sententious pretension or
         antithetical prettiness.                 --Jeffrey.

Source : WordNet®

prettiness
     n : the quality of being appealing in a delicate or graceful way
         (of a girl or young woman) [syn: {cuteness}]