| hard-core(determined, impulsive, stubborn, reckless, impetuous) |
| hard-shell(determined, impulsive, stubborn, reckless, impetuous) |
| heedless(determined, impulsive, stubborn, reckless, impetuous) |
| imprudent(determined, impulsive, stubborn, reckless, impetuous) |
| inexorable(adjective, determined, resolute, obstinate, uncompromising) |
| locked-in(determined, impulsive, stubborn, reckless, impetuous) |
| mule(determined, impulsive, stubborn, reckless, impetuous) |
| murder(determined, impulsive, stubborn, reckless, impetuous) |
| pigheaded(adjective, impulsive, obstinate, stubborn, reckless) |
| rash(determined, impulsive, stubborn, reckless, impetuous) |
| reckless(determined, impulsive, stubborn, impetuous) |
| refractory(determined, impulsive, obstinate, stubborn, reckless) |
| relentless(adjective, determined, resolute, obstinate, uncompromising) |
| resistant(adjective, determined, resolute, obstinate, uncompromising) |
| self-willed(adjective, determined, impulsive, obstinate, stubborn) |
| set(adjective, determined, resolute, obstinate, uncompromising) |
| set in stone(adjective, determined, resolute, obstinate, uncompromising) |
| standing pat(adjective, determined, resolute, obstinate, uncompromising) |
| steadfast(adjective, determined, resolute, obstinate, uncompromising) |
| stiff(adjective, determined, resolute, obstinate, uncompromising) |