| tenable(adjective, strain, firmness, labour, hardiness) |
| enormous(adjective, feature, characteristic, person, body) |
| herculean(adjective, feature, characteristic, force, energy) |
| stationary(adjective, strain, firmness, labour, hardiness) |
| defensive(adjective, strain, firmness, labour, hardiness) |
| constant(adjective, calm, good, tough, strain) |
| long-standing(adjective, strain, firmness, labour, hardiness) |
| rock-solid(adjective, hard, strain, firmness, compact) |
| unalterable(adjective, strain, firmness, labour, hardiness) |
| withstanding(adjective, strain, stiff, firmness, sturdy) |
| immense(adjective, feature, characteristic, person, body) |
| immune(adjective, strain, firmness, safe, unaffected) |
| resist(verb, adjective, strain, firmness, labour) |
| hulking(adjective, feature, characteristic, solid, large) |
| prodigious(adjective, feature, characteristic, person, body) |
| settled(adjective, secure, easy, strain, flat) |
| viable(adjective, strain, firmness, labour, hardiness) |
| endurant(adjective, strain, firmness, labour, hardiness) |
| gigantic(adjective, feature, characteristic, size) |
| stabile(adjective, strain, firmness, labour, hardiness) |