| intransigent(adjective, tough, determined, resolute, stubborn) |
| persevering(adjective, tough, firm, unreasonable, grim) |
| set(adjective, resolute) |
| unbending(adjective, hard, tough, rough, harsh) |
| undisciplined(adjective, tough, violent, wild, awkward) |
| unmanageable(adjective, tough, firm, obstinate, stubborn) |
| unrelenting(adjective, strong, tough, firm, cold) |
| adamantine(adjective, determined, resolute, uncompromising, unshakeable) |
| firm(adjective, hard, tough, rough, harsh) |
| inexorable(adjective, tough, firm, determined, resolute) |
| insubordinate(adjective, tough, firm, negative, hostile) |
| mutinous |
| persistent(adjective, tough, firm, determined, unreasonable) |
| rebellious(adjective, tough, firm, negative, hostile) |
| rigid(adjective, tough, firm, unreasonable, inflexible) |
| steadfast(adjective, tough, firm, determined, unreasonable) |
| stern(adjective, hard, tough, rough, harsh) |
| uncooperative(adjective, tough, difficult, wild, awkward) |
| defiant |
| foolhardy(adjective, careless, bold, impulsive, rash) |