unfriendship

from The Collaborative International Dictionary of English v.0.48

Unfriendship \Un*friend"ship\, n.
   The state or quality of being unfriendly; unfriendliness;
   enmity.
   [1913 Webster]

         An act of unfriendship to my sovereign person. --Sir W.
                                                  Scott.
   [1913 Webster]