| stubborn(adjective, resolute, determined, obstinate, characteristic) |
| inflexible(adjective, mean, hard, secure, tough) |
| rigid(adjective, mean, hard, tough, severe) |
| intransigent(adjective, tough, resist, determined, resolute) |
| unyielding(adjective, mean, clear, hard, secure) |
| obdurate(adjective, hard, secure, tough, severe) |
| determined(adjective, clear, tough, severe, firm) |
| resolute(adjective, clear, hard, secure, tough) |
| inexorable(adjective, mean, hard, tough, severe) |
| unbending(adjective, mean, clear, hard, tough) |
| firm(adjective, mean, clear, hard, secure) |
| unrelenting(adjective, mean, hard, tough, severe) |
| relentless(adjective, mean, hard, tough, severe) |
| immovable(adjective, mean, hard, secure, determined) |
| insistent(adjective, determined, resolute, obstinate, unshakeable) |
| obstinate(adjective, mean, hard, tough, severe) |
| stiff(adjective, hard, tough, severe, rough) |
| adamant(adjective, mean, hard, secure, rough) |
| fixed(adjective, mean, hard, secure, rough) |
| set(adjective, secure, firm, certain, determined) |