The Collaborative International Dictionary of English v.0.48:
Hard-hearted \Hard"-heart`ed\ (-h[aum]rt`[e^]d), a. Unsympathetic; inexorable; cruel; pitiless. -- Hard"-heart`ed*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
hardheartedness n 1: an absence of concern for the welfare of others [syn: heartlessness, coldheartedness, hardheartedness]