| unresponsive(adjective, coldhearted) |
| coldblooded(unyielding, unforgiving) |
| compassionless(adjective, mean, hard, severe, harsh) |
| feral(adjective, mean, harsh, violent, cruel) |
| fiendish(adjective, pitiless) |
| flinty |
| hard of heart(expression, idiom, malevolence) |
| hardened(adjective, hard, tough, harsh, cruel) |
| hellish(adjective, pitiless) |
| hurtful(adjective, mean, severe, harsh, cruel) |
| monstrous(adjective, severe, harsh, cruel) |
| mortal(adjective, mean, severe, harsh, cruel) |
| murderous(adjective, hard, tough, harsh, violent) |
| rancorous(adjective, mean, harsh, cruel, vicious) |
| sadistic(adjective, mean, harsh, cruel, vicious) |
| tigerish(adjective, violent, cruel, vicious, fierce) |
| uncompromising(adjective, cruel, pitiless, heartless, hardhearted) |
| vengeful(adjective, severe, harsh, cruel) |
| vindictive(adjective, mean, hard, tough, severe) |
| violent(adjective, cruel, vicious, fierce, savage) |