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