| diligent(adjective, resolute) |
| disconsolate |
| dismal |
| dog-eat-dog(adjective, mean, hard, severe, harsh) |
| faithful(adjective, intense, resolute, persistent, dedicated) |
| fateful(expected, predictable, necessary, undeniable, unavoidable) |
| fierce(adjective, mean, hard, tough, severe) |
| froward |
| gloomy |
| gritty(resolution, rocky, pebbly, flinty) |
| hard-core(adjective, strong, hard, tough, severe) |
| hard-hearted(adjective, mean, hard, tough, evil) |
| hardhearted(adjective, mean, hard, severe, harsh) |
| hell-bent(adjective, persistent, obstinate, insistent, dogged) |
| immutable(hard, resolute, rigid, inflexible, strict) |
| inevasible(certain, obvious, inevitable, inescapable) |
| insubordinate(tough, firm, persistent, obstinate, stubborn) |
| intent(adjective, intense, resolute, persistent, rigid) |
| invincible(adjective, strong, persistent, obstinate, insistent) |
| loyal(adjective, intense, resolute, persistent, dedicated) |