The Collaborative International Dictionary of English v.0.48:

Starchedness \Starch"ed*ness\ (st[aum]rch"[e^]d*n[e^]s), n.
   The quality or state of being starched or starchy[5];
   stiffness in manners; formality.

   Syn: starchiness, starchness.
        [1913 Webster]