| dogged(adjective, tough, firm, determined, resolute) |
| inflexible(adjective, tough, firm, determined, resolute) |
| intransigent(adjective, tough, determined, resolute, stubborn) |
| obdurate(adjective, tough, firm, difficult, determined) |
| opinionated(adjective, tough, firm, determined, resolute) |
| stiff-necked(adjective, tough, firm, determined, resolute) |
| ungovernable(adjective, tough, difficult, wild, determined) |
| unmanageable(adjective, tough, firm, difficult, wild) |
| hardheaded(adjective, tough, firm, determined, resolute) |
| pertinacious(adjective, tough, firm, difficult, determined) |
| uncontrollable(adjective, determined, impulsive, stubborn, reckless) |
| wayward(adjective, tough, difficult, wild, foolish) |
| wild |
| contradictory(determined, fixed, obstinate, stubborn, willful) |
| determined(adjective, tough, firm, deliberate, fixed) |
| difficult(adjective, tough, wild, awkward, obstinate) |
| hard(adjective, determined, fixed, resolute, stubborn) |
| insubordinate(adjective, tough, firm, unreasonable, grim) |
| undisciplined(adjective, tough, difficult, wild, foolish) |
| unrestrained(adjective, rough, foolish, crazy, irrational) |