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