Source : Webster's Revised Unabridged Dictionary (1913)

Unaffected \Un`af*fect"ed\, a.
   1. Not affected or moved; destitute of affection or emotion;
      uninfluenced.

            A poor, cold, unspirited, unmannered, Unhonest,
            unaffected, undone fool.              --J. Fletcher.

   2. Free from affectation; plain; simple; natural; real;
      sincere; genuine; as, unaffected sorrow. --
      {Un`af*fect"ed*ly}, adv. -- {Un`af*fect"ed*ness}, n.

Source : WordNet®

unaffectedness
     n : not affected; a personal manner that is not consciously
         constrained [ant: {affectedness}]