| mulish(adjective, mean, hard, deliberate, determined) |
| intractable(adjective, hard, tough, rough, firm) |
| steely(adjective, set, determined, resolute, unsympathetic) |
| uncompliant(adjective, resist, determined, unreasonable, resolute) |
| austere(adjective, severe, rigid, severity) |
| hanging tough(expression, adjective, mean, hard, determined) |
| hidebound(adjective, severe, determined, resolute, obstinate) |
| iron(adjective, mean, hard, resist, determined) |
| remorseless(adjective, harsh, resist, cruel, determined) |
| stiff-necked(adjective, mean, hard, severe, deliberate) |
| stringent(adjective, hard, severe, rough, difficult) |
| unshakeable(adjective, determined, resolute) |
| headstrong(adjective, tough, firm, determined, resolute) |
| incompliant(adjective, tough, firm, resist, determined) |
| inelastic(adjective, tough, firm, determined, distant) |
| pertinacious(adjective, tough, firm, determined, resolute) |
| resolved(adjective, firm, deliberate, determined, resolute) |
| contrary(adjective, tough, difficult, determined, resolute) |
| pat(adjective, tough, difficult, determined, resolute) |
| strong(adjective, determined, resolute, rigid, stubborn) |