| persistent(adjective, strain, firmness, labour, hardiness) |
| stable(adjective, calm, quiet, strong, secure) |
| firm(noun, adjective, strain, stable, firmness) |
| strong(adjective, strain, firmness, labour, hardiness) |
| stiff(adjective, strain, firmness, labour, hardiness) |
| sound(adjective, strain, firmness, labour, hardiness) |
| unfluctuating(adjective, strain, firmness, labour, hardiness) |
| permanent(adjective, moving, strain, fixed, firmness) |
| immobile(adjective, adverb, move, calm, quiet) |
| settled(adjective, strain, firmness, labour, hardiness) |
| quiescent(adjective, strain, firmness, labour, hardiness) |
| fixed(adjective, move, calm, quiet, strong) |
| motionless(adjective, adverb, move, calm, quiet) |
| still(adjective, adverb, move, calm, quiet) |
| constant(adjective, strain, firmness, labour, hardiness) |
| steadfast(adjective, move, strain, firmness, labour) |
| steady(adjective, move, strain, firmness, labour) |
| fast(adjective, strain, firmness, labour, hardiness) |
| rigid(adjective, strain, firmness, labour, hardiness) |
| invariable(adjective, strain, firmness, labour, hardiness) |