The Collaborative International Dictionary of English v.0.48:

Seemliness \Seem"li*ness\, n.
   The quality or state of being seemly: comeliness; propriety.
   [1913 Webster]

WordNet (r) 3.0 (2006):

seemliness
    n 1: a sense of propriety and consideration for others; "a place
         where the company of others must be accepted with good
         grace" [syn: seemliness, grace] [ant: unseemliness]