| immovable(adjective, mean, strong, hard, secure) |
| tight(adjective, close, strong, hard, free) |
| uncompromising(adjective, mean, clear, hard, secure) |
| settled(adjective, characteristic, set, strong, secure) |
| durable(adjective, calm, strong, sound, secure) |
| set(verb, adjective, business, company, characteristic) |
| unbending(adjective, mean, clear, strong, hard) |
| enduring(adjective, calm, close, strong, sound) |
| stout(adjective, calm, strong, sound, tough) |
| permanent(adjective, calm, strong, secure, tough) |
| unalterable(adjective, characteristic, calm, strong, hard) |
| inexorable(adjective, mean, strong, hard, tough) |
| obdurate(adjective, strong, hard, secure, tough) |
| refractory(adjective, hard, strain, rough, harsh) |
| lasting(adjective, calm, strong, secure, tough) |
| stationary(adjective, strain, stable, firmness, labour) |
| unwavering(adjective, calm, close, strong, secure) |
| intransigent(adjective, determined, resolute, obstinate, stubborn) |
| invariable(adjective, calm, strong, secure, strain) |
| robust(adjective, strong, hard, sound, complete) |