| diabolical(adjective, animal, mean, violent, cruel) |
| evil(adjective, nasty, harsh, vicious, wicked) |
| feral(adjective, rough, violent, cruel, vicious) |
| indifferent(adjective, mean, hard, harsh, cold) |
| infernal(adjective, violent, vicious, fierce, unrestrained) |
| inflexible(adjective, terrible behavior) |
| malign(adjective, animal, mean, cruel, vicious) |
| nasty(adjective, mean, evil, negative, ill) |
| obdurate(adjective, mean, hard, tough, harsh) |
| painful(adjective, evil, nasty, harsh, vicious) |
| relentless(adjective, animal, mean, hard, tough) |
| rude(adjective, mean, sharp, rough, harsh) |
| sanguinary(adjective, hard, tough, harsh, violent) |
| satanic(adjective, mean, hard, harsh, cold) |
| soulless(adjective, mean, hard, harsh, cold) |
| stony-hearted |
| thoughtless(adjective, mean, nasty, ill, hostile) |
| tyrannical(adjective, hard, tough, evil, nasty) |
| uncaring(adjective, person, mean, severe, nasty) |
| uncivilised |