| implacable(adjective, resist, determined, resolute, persistent) |
| iron(adjective, resist, determined, resolute, persistent) |
| relentless(adjective, resist, determined, resolute, persistent) |
| remorseless(adjective, resist, determined, resolute, persistent) |
| disobedient |
| rebellious(adjective, stubborn) |
| recalcitrant(adjective, tough, firm, difficult, wild) |
| adamant(adjective, resist, determined, resolute, persistent) |
| contrary(adjective, tough, difficult, wild, awkward) |
| determined(adjective, resolute, stubborn, uncompromising, unshakeable) |
| headstrong(adjective, tough, firm, difficult, awkward) |
| pertinacious(adjective, tough, firm, difficult, awkward) |
| perverse(adjective, tough, firm, difficult, awkward) |
| tenacious(adjective, tough, firm, difficult, wild) |
| unruly(adjective, tough, difficult, wild, awkward) |
| cantankerous(adjective, tough, firm, difficult, wild) |
| contumacious(adjective, stubborn) |
| defiant |
| fixed(adjective, hard, firm, solid, stiff) |
| fractious(adjective, obstinate, stubborn, willful) |