| set(adjective, determined, stiff, resolute, obstinate) |
| obstinate(adjective, firm, determined, resolute, stubborn) |
| unbendable(adjective, resist, determined, resolute, persistent) |
| implacable(adjective, tough, resist, determined, resolute) |
| hard-nosed(adjective, determined, resolute, obstinate, uncompromising) |
| grim(adjective, resist, determined, resolute, persistent) |
| tenacious(adjective, strong, firm, determined, unreasonable) |
| unswayable(adjective, determined, resolute, rigid, obstinate) |
| dogged(adjective, tough, determined, resolute, stubborn) |
| hanging tough(expression, adjective, determined, resolute, persistent) |
| hard(adjective, severe, determined, stiff, resolute) |
| intractable(adjective, tough, firm, difficult, determined) |
| pertinacious(adjective, determined, resolute, obstinate, stubborn) |
| set in stone(adjective, determined, resolute, obstinate, uncompromising) |
| standing pat(adjective, determined, resolute, obstinate, uncompromising) |
| stiff-necked(adjective, firm, deliberate, determined, unreasonable) |
| die-hard(adjective, resist, determined, resolute, persistent) |
| iron(adjective, tough, resist, determined, resolute) |
| mulish(adjective, determined, resolute, obstinate, stubborn) |
| remorseless(adjective, tough, resist, determined, unreasonable) |