Same word as hatchetjob:

austere, barbarous, brutal, callous, cold, coldblooded, coldhearted, cruel, cutthroat, dog-eat-dog, frigid, hardhearted, harsh, hatchetjob, heartless, implacable, indifferent, inexorable, inhuman, inhumane, insensible, killer instinct, mean, merciless, obdurate, relentle