Hard-hearted

from 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]

from Moby Thesaurus II by Grady Ward, 1.0

40 Moby Thesaurus words for "hardhearted":
      Philistine, brazen, callous, calloused, case-hardened, cold,
      cold of heart, coldblooded, coldhearted, conscienceless,
      flinthearted, flinty, hard, hard of heart, hard-boiled, hardened,
      heartless, impervious, indurated, insensitive, inured,
      lost to shame, obdurate, pachydermatous, proof against, seared,
      shameless, steeled against, steely, stony, stonyhearted,
      thick-skinned, unblushing, uncompassionate, unemotional, unfeeling,
      unmerciful, unnatural, unresponsive, unsympathetic