| cantankerous(difficult, wild, awkward, persistent, obstinate) |
| contrary(difficult, wild, awkward, persistent, obstinate) |
| daring(adjective, strong, bold, resolute, spirited) |
| dedicated(adjective, strong, firm, determined, steady) |
| difficult(adjective, great, tough, wild, awkward) |
| earnest(adjective, resolute) |
| froward(adjective, irritable, persistent, restless, obstinate) |
| gallant(adjective, strong, tough, determined, noble) |
| hard-shell(adjective, strong, hard, tough, persistent) |
| hardy(adjective, strong, tough, powerful, bold) |
| hidebound(adjective, persistent, obstinate, stubborn, unbending) |
| immovable(adjective, strong, hard, tough, difficult) |
| immutable(hard, resolute, rigid, inflexible, strict) |
| implacable(adjective, set, strong, hard, tough) |
| inalterable(adjective, inflexible) |
| incompliant(tough, difficult, wild, awkward, obstinate) |
| indocile(tough, difficult, violent, wild, awkward) |
| intent(adjective, resolute) |
| inviolable |
| persevering a(expression, idiom, resolution, courage, resistance) |