| continual(adjective, continue, determined, usual, steady) |
| unremitting(adjective, sound, continue, determined, steady) |
| continuous(adjective, sound, continue, steady, persistent) |
| sustained(adjective, strain, firmness, persistent, constant) |
| stationary(adjective, strain, firmness, labour, hardiness) |
| steadfast(adjective, strain, determined, steady, stable) |
| interminable(adjective, continue, determined, steady, persistent) |
| uninterrupted(adjective, sound, continue, steady, stable) |
| long-standing(adjective, strain, firmness, labour, hardiness) |
| rigid(adjective, strain, firmness, labour, hardiness) |
| settled(adjective, strain, firmness, labour, hardiness) |
| staying(adjective, strain, firmness, labour, hardiness) |
| quiescent(adjective, strain, firmness, labour, hardiness) |
| seamless(adjective, strain, firmness, continuous, labour) |
| stabile(adjective, strain, steady, stable, regular) |
| unalterable(adjective, strain, steady, stable, regular) |
| unyielding(adjective, strain, firmness, labour, hardiness) |
| fast(adjective, strain, firmness, labour, hardiness) |
| never-ending(adjective, continue, determined, constant, obstinate) |
| perennial(adjective, stable, constant, continuous, enduring) |