| essential(adjective, physical, importance, material, big) |
| invariable(adjective, strain, firmness, labour, hardiness) |
| physical(adjective, body, hard, solid, material) |
| real(adjective, solid, physical, material, enthusiastic) |
| resilient(adjective, strain, firmness, labour, hardiness) |
| resistant(adjective, strain, firmness, labour, hardiness) |
| serious(adjective, importance, big, heavy, important) |
| sizeable(adjective, significant, large) |
| stabile(adjective, calm, strong, secure, strain) |
| stationary(adjective, strain, firmness, labour, hardiness) |
| tenable(adjective, strain, firmness, labour, hardiness) |
| tight(adjective, close, strong, hard, strain) |
| unalterable(adjective, strain, firmness, labour, hardiness) |
| unyielding(adjective, strong, hard, sound, tough) |
| well-balanced(adjective, strain, firmness, labour, hardiness) |
| long-standing(adjective, strain, firmness, labour, hardiness) |
| momentous(adjective, strong, importance, big, heavy) |
| rigid(adjective, strain, firmness, labour, hardiness) |
| substantive(adjective, material, certain, real, genuine) |
| generous(adjective, good, give, great, fair) |