| harebrained(adjective, careless, bold, thoughtless, impulsive) |
| impetuous(adjective, passionate, violent, careless, wild) |
| imprudent(adjective, mean, violent, careless, wild) |
| incompliant(adjective, tough, firm, difficult, awkward) |
| inconvincible(adjective, determined, resolute, uncompromising, unshakeable) |
| incorrigible(adjective, mean, passionate, violent, wild) |
| indefatigable(adjective, resolute, tenacious) |
| insuppressible(careless, wild, violence, thoughtless, impulsive) |
| irresponsible(adjective, careless, bold, rash, reckless) |
| murder(adjective, impulsive, stubborn, reckless, impetuous) |
| ornery(adjective, tough, firm, cross, passionate) |
| plucky(adjective, resolute, tenacious) |
| rogue |
| ruthless(adjective, resolute) |
| self-opinionated(adjective, determined, resolute, uncompromising, unshakeable) |
| single-minded(adjective, tough, firm, unreasonable, grim) |
| staunch(adjective, resolute, tenacious) |
| steely(adjective, resolute) |
| strongheaded |
| temperamental(adjective, unpredictable, unreliable, erratic, moody) |