From The Collaborative International Dictionary of English v.0.48 :
Affectedness \Af*fect"ed*ness\, n.
Affectation.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
affectedness
n 1: the quality of being false or artificial (as to impress
others) [ant: unaffectedness]
2: a deliberate pretense or exaggerated display [syn:
affectation, mannerism, pose, affectedness]