Source : Webster's Revised Unabridged Dictionary (1913)

Deadness \Dead"ness\, n.
   The state of being destitute of life, vigor, spirit,
   activity, etc.; dullness; inertness; languor; coldness;
   vapidness; indifference; as, the deadness of a limb, a body,
   or a tree; the deadness of an eye; deadness of the
   affections; the deadness of beer or cider; deadness to the
   world, and the like.

Source : WordNet®

deadness
     n 1: the physical property of something that has lost its
          elasticity; "he objected to the deadness of the tennis
          balls"
     2: the inanimate property of something that has died