The Collaborative International Dictionary of English v.0.48:

Stateliness \State"li*ness\, n.
   The quality or state of being stately.
   [1913 Webster]

         For stateliness and majesty, what is comparable to a
         horse?                                   --Dr. H. More.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stateliness
    n 1: an elaborate manner of doing something; "she served coffee
         with great stateliness"
    2: impressiveness in scale or proportion [syn: stateliness,
       majesty, loftiness]