The Collaborative International Dictionary of English v.0.48:

Loveliness \Love"li*ness\, n. [From Lovely.]
   The state or quality of being lovely.
   [1913 Webster]

         If there is such a native loveliness in the sex as to
         make them victorious when in the wrong, how resistless
         their power when they are on the side of truth!
                                                  --Spectator.
   [1913 Webster]

WordNet (r) 3.0 (2006):

loveliness
    n 1: the quality of being good looking and attractive [syn:
         comeliness, fairness, loveliness, beauteousness]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "loveliness":
   adorability, agreeability, allurement, amiability, appeal,
   appealingness, attractiveness, beauteousness, beautifulness,
   beauty, beauty unadorned, bewitchment, bloom, captivation, charm,
   delightfulness, desirability, elegance, enchantment, enravishment,
   entrancement, exquisiteness, fascination, glamour, glow, grace,
   handsomeness, invitingness, likability, lovability, lovesomeness,
   luxury, prettiness, pulchritude, sensuousness, sweetness,
   tantalizingness, temptingness, the beautiful, voluptuousness,
   winning ways, winningness, winsomeness, witchery