| insubordinate(tough, firm, unreasonable, grim, inflexible) |
| intent(adjective, resolute) |
| intolerant |
| iron-willed(adjective, resolute) |
| locked-in(determined, impulsive, stubborn, reckless, impetuous) |
| locked in(expression, adjective, tough, severe, stiff) |
| loyal(adjective, resolute) |
| mortified(adjective, strong, hard, tough, severe) |
| mule(tough, firm, determined, unreasonable, grim) |
| murder(determined, impulsive, stubborn, reckless, impetuous) |
| ornery(tough, firm, unreasonable, grim, inflexible) |
| ossified(adjective, determined, resolute, uncompromising, unshakeable) |
| overzealous |
| rash(determined, impulsive, stubborn, reckless, impetuous) |
| rebellious(tough, firm, unreasonable, grim, inflexible) |
| reckless(determined, impulsive, stubborn, impetuous) |
| reliable(adjective, resolute) |
| restive |
| rigorous(adjective, strong, hard, tough, severe) |
| rough(adjective, strong, hard, tough, severe) |