THESAURUS
acuteness, animality, atrocity, barbarity, bloodlust, brutality, callosity, callousness, coldbloodedness, coldheartedness, coldness, destructiveness, extremity, ferociousness, fierceness, force, furiousness, hardheartedness, hardness, hardness of heart, harshness, heart of stone, heartlessness, impetuosity, inclemency, inhumanity, insensitivity, intensity, malignity, mercilessness, mindlessness, murderousness, obduracy, rigor, roughness, savagery, severity, sharpness, terrorism, unfeeling, ungentleness, unmercifulness, unnaturalness, unresponsiveness, vandalism, vehemence, venom, viciousness, violence, virulence
ROGET THESAURUS
Pitilessness
N
pitilessness, inclemency, severity, malevolence, pitiless, merciless, ruthless, bowelless, unpitying, unmerciful, inclement, grim-faced, grim-visaged, incompassionate, uncompassionate, inexorable, harsh, unrelenting.