| embrittlement(noun, feature, ability, physical, property) |
| firmness(noun, feature, ability, physical, property) |
| flimsiness(noun, feature, ability, physical, property) |
| frailness(noun, feature, ability, physical, property) |
| frangibility(noun, feature, ability, physical, property) |
| friability(noun, feature, ability, physical, property) |
| hardness(noun, feature, ability, physical, property) |
| inexorableness(noun, stubbornness, inflexibility, obduracy, rigidness) |
| intractability(noun, feature, ability, physical, property) |
| solidity(noun, feature, ability, physical, property) |
| steadfastness(noun, feature, ability, physical, property) |
| steadiness(noun, feature, ability, physical, property) |
| steel(noun, feature, ability, physical, property) |
| stiffness(noun, feature, ability, physical, property) |
| tenacity(noun, feature, ability, physical, property) |
| vertebration(noun, feature, ability, physical, property) |
| crispiness(noun, feature, ability, physical, property) |
| mulishness(noun, feature, person, negative) |
| obstinacy(noun, feature, person, negative) |
| unyieldingness(noun, feature, person, negative) |