killer instinct

aggressive ambitious competing cutthroat vying

antagonistic at odds combative dog-eat-dog emulous killer opposing rival streetwise

noncompetitive unambitious

austere barbarous brutal callous cold coldblooded coldhearted cruel cutthroat dog-eat-dog frigid hardhearted harsh hatchetjob heartless implacable indifferent inexorable inhuman inhumane insensible mean merciless obdurate relentless remorseless ruthless satanic savage soulless stony

charitable kind merciful sympathetic