| perverse(adjective, mean, hard, tough, firm) |
| pigheaded(adjective, mean, hard, tough, firm) |
| resolved(adjective, determined, resolute, uncompromising, unshakeable) |
| retaliatory(adjective, mean, hateful, malicious, spiteful) |
| rigorous(adjective, strong, hard, tough, harsh) |
| rock-ribbed(adjective, determined, resolute, uncompromising, unshakeable) |
| strong-willed(adjective, determined, resolute, uncompromising, unshakeable) |
| unmoved |
| unshakeable(adjective, determined, resolute, uncompromising) |
| barbaric(adjective, animal, mean, violent, cruel) |
| bitter(adjective, strong, hard, tough, severe) |
| bold(adjective, resolute) |
| constant(adjective, resolute) |
| decided(adjective, resolute) |
| decisive(adjective, resolute) |
| dedicated(adjective, resolute) |
| diligent(adjective, resolute) |
| fell(adjective, animal, mean, violent, cruel) |
| fierce(adjective, animal, mean, hard, tough) |
| fixed(adjective, mean, hard, tough, firm) |