| settled(adjective, strain, firmness, labour, hardiness) |
| fast(adjective, strain, firmness, labour, hardiness) |
| steady(adjective, calm, strong, secure, strain) |
| long-standing(adjective, continue, strain, firmness, labour) |
| immutable(adjective, calm, strong, secure, firm) |
| staying(adjective, strain, firmness, labour, hardiness) |
| unchanging(adjective, firm, steady, stable, regular) |
| abiding(adjective, calm, strong, secure, tough) |
| impregnable(adjective, strain, firmness, labour, hardiness) |
| rigid(adjective, strain, firmness, labour, hardiness) |
| stabile(adjective, calm, strong, secure, strain) |
| stout(adjective, strain, firmness, labour, hardiness) |
| substantial(adjective, strain, firmness, labour, hardiness) |
| sustained(adjective, strain, firmness, persistent, continuous) |
| changeless(adjective, stable, fixed, constant, enduring) |
| quiescent(adjective, strain, firmness, labour, hardiness) |
| resistant(adjective, strain, firmness, labour, hardiness) |
| tight(adjective, strain, firmness, labour, hardiness) |
| unyielding(adjective, strain, firmness, labour, hardiness) |
| unchangeable(adjective, calm, strong, solid, substantial) |