| persistent(adjective, strain, firmness, labour, hardiness) |
| stable(adjective, calm, secure, strain, still) |
| firm(adjective, strain, firmness, labour, hardiness) |
| stiff(adjective, strain, firmness, labour, hardiness) |
| stationary(adjective, strain, firmness, labour, hardiness) |
| quiet(adjective, calm, dull, close, cool) |
| enduring(adjective, quiet, gentle, strain, flat) |
| staying(adjective, strain, firmness, labour, hardiness) |
| steadfast(adjective, strain, firmness, labour, hardiness) |
| constant(adjective, strain, firmness, labour, hardiness) |
| durable(adjective, strain, firmness, labour, hardiness) |
| lasting(adjective, strain, firmness, labour, hardiness) |
| permanent(adjective, strain, firmness, labour, hardiness) |
| perpetual(adjective, strain, firmness, labour, hardiness) |
| sustained(adjective, strain, firmness, labour, hardiness) |
| rigid(adjective, strain, firmness, labour, hardiness) |
| still(verb, adjective, adverb, calm, dull) |
| tolerant(adjective, strain, firmness, labour, hardiness) |
| peaceful(adjective, calm, close, quiet, cool) |
| inactive(adjective, action, calm, dull, quiet) |