The Collaborative International Dictionary of English v.0.48:

coldhearted \cold"heart`ed\, cold-hearted \cold"-heart`ed\, a.
   Wanting passion or feeling or emotional warmth; indifferent.
   -- cold"-heart`ed*ness, n.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

cold-heartedness \cold"-heart`ed*ness\ n.
   an absence of concern for the welfare of others; indifference
   to the suffering of others.

   Syn: heartlessness, hardheartedness.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

coldheartedness
    n 1: an absence of concern for the welfare of others [syn:
         heartlessness, coldheartedness, hardheartedness]