| hatchetjob(adjective, cold, indifferent) |
| having a killer instinct(expression, adjective, idiom, mean, severe) |
| heartless(adjective, mean, severe) |
| implacable(adjective, mean, severe, heartless) |
| indifferent(adjective, cold) |
| inexorable(adjective, mean, severe, heartless) |
| inhuman(adjective, cold, indifferent) |
| inhumane(adjective, mean, severe, heartless, ironfisted) |
| insensible(adjective, cold, indifferent) |
| iron-fisted(adjective, mean, severe, heartless, ironfisted) |
| ironfisted(adjective, malevolent, sadistic, homicidal) |
| killer(adjective, ambitious, competing, ironfisted, homicidal) |
| killer instinct(expression, adjective, rival, ambitious, competing) |
| malevolent(adjective, sadistic) |
| mean(adjective, severe, heartless) |
| mean machine(expression, adjective, mean, severe, heartless) |
| merciless(adjective, vicious, fierce, ironfisted) |
| mortal(adjective, mean, severe, heartless) |
| obdurate(adjective, cold, indifferent) |
| opposing(adjective, ambitious, competing) |