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):
hardhearted adj 1: lacking in feeling or pity or warmth [syn: hardhearted, heartless] [ant: soft-boiled, softhearted] 2: devoid of feeling for others; "an unfeeling wretch" [syn: hardhearted, stonyhearted, unfeeling]