| sound(adjective, strain, sensible, equal, firmness) |
| stable(adjective, calm, sound, strain, rational) |
| firm(adjective, strain, firmness, labour, hardiness) |
| consistent(adjective, strain, firmness, even, labour) |
| unfluctuating(adjective, strain, firmness, normal, even) |
| steady(adjective, sound, strain, rational, stable) |
| fast(adjective, strain, firmness, labour, hardiness) |
| steadfast(adjective, strain, firmness, labour, hardiness) |
| constant(adjective, strain, firmness, even, labour) |
| invariable(adjective, strain, firmness, even, labour) |
| well balanced(expression, adjective, idiom, strain, firmness) |
| substantial(adjective, strain, firmness, labour, hardiness) |
| rigid(adjective, strain, firmness, even, labour) |
| unalterable(adjective, strain, firmness, even, labour) |
| rational(adjective, sensible, equal, stable, normal) |
| reasonable(adjective, sensible, rational, equal, stable) |
| sane(adjective, sensible, rational, equal, stable) |
| symmetrical(adjective, sensible, rational, equal, stable) |
| balanced(adjective, rational, stable, sane, symmetrical) |
| logical(adjective, sensible, rational, equal, stable) |