adjective

incapable of being moved to pity or tenderness; unfeeling.

only the most hard-hearted man would not have offered comfort

unfeeling,heartless,cold,hard,unsympathetic,uncaring,unloving,unconcerned,indifferent,intolerant,unmoved,unkind,uncharitable,unemotional,stony,cold-hearted,cold-blooded,lacking compassion,mean-spirited,without sentiment,stony-hearted,with a heart of stone,hard as nails,cruel,brutal,callous,savage,inhuman,merciless,pitiless