atrocious barbaric barbarous bestial bloody bowelless brutal brutish coldhearted cruel cutthroat dog-eat-dog feral ferine ferocious fierce flinty hard hardhearted harsh heartless inclement inexorable inhuman inhumane ironhearted kill-crazy malign malignant marblehearted merciless murderous noncivilized relentless remorseless ruthless sanguinary savage stony tameless uncivilized uncompassionate uncompassioned unfeeling unforgiving ungentle unmerciful unpitiful unpitying unremorseful unsympathetic unsympathizing untamed unyielding vicious wild without mercy