| grim(adjective, animal, mean, tough, harsh) |
| stubborn(adjective, characteristic, quality, resist, cruel) |
| uncompromising(adjective, harsh, resist, cruel, determined) |
| brutal(adjective, mean, severe, harsh, violent) |
| inhuman(adjective, animal, mean, harsh, violent) |
| intransigent(adjective, tough, resist, determined, unreasonable) |
| rigid(adjective, harsh, resist, cruel, determined) |
| unapologetic |
| hard(adjective, mean, severe, harsh, cruel) |
| hard-hearted(adjective, mean, hard, severe, harsh) |
| unrepentant(adjective, regret, impenitent, impenitence) |
| fierce(adjective, animal, mean, harsh, violent) |
| unforgiving(adjective, mean, severe, harsh, cruel) |
| barbarous(adjective, animal, mean, harsh, violent) |
| cold-blooded(adjective, mean, hard, harsh, violent) |
| unfeeling(adjective, animal, mean, hard, severe) |
| uncontrite(adjective, impenitent, impenitence) |
| unremorseful(adjective, impenitent) |
| adamant(adjective, mean, tough, harsh, resist) |
| adamantine(adjective, resist, determined, resolute, persistent) |