| density(noun, protection, security, rigidity, hardness) |
| fixedness(noun, protection, security, rigidity, hardness) |
| compactness(noun, protection, security, rigidity, hardness) |
| durability(noun, protection, security, rigidity, hardness) |
| impenetrability(noun, protection, security, rigidity, hardness) |
| impermeability(noun, protection, security, rigidity, hardness) |
| imperviousness(noun, protection, security, rigidity, hardness) |
| impliability(noun, protection, security, rigidity, hardness) |
| inelasticity(noun, protection, security, rigidity, hardness) |
| inflexibility(noun, protection, security, rigidity, hardness) |
| pries |
| rating |
| resistance(noun, protection, security, rigidity, hardness) |
| rigidity(noun, protection, security, hardness, density) |
| solidity(noun, protection, security, rigidity, hardness) |
| temper(noun, protection, security, rigidity, hardness) |
| toughness(noun, protection, security, rigidity, hardness) |
| enduringness |
| firmness(rigidity, hardness) |
| hardness(noun, protection, security, rigidity, density) |