| permanence(noun, support, control, strength, balance) |
| harshness(noun, power, abuse, easy, difficulty) |
| rigidity(noun, easy, condition, discipline, firmness) |
| severity(noun, power, abuse, easy, difficulty) |
| callousness(noun, cruelty, insensitivity, coldness, impenitence) |
| rigor(noun, easy, condition, discipline, firmness) |
| stiffness(noun, firmness, protection, severity, security) |
| toughness(noun, support, control, power, strength) |
| austerity(noun, easy, condition, discipline, firmness) |
| firmness(noun, support, control, change, strength) |
| rigorousness(noun, easy, condition, discipline, firmness) |
| rigour |
| solidity(noun, support, control, strength, balance) |
| difficulty(noun, difficulty, discipline, severity, harshness) |
| inclemency(noun, severity, harshness, conformity, strictness) |
| strength(noun, support, control, change, continue) |
| unfeelingness(noun, cruelty) |
| callosity |
| roughness(noun, power, difficulty, violence, severity) |
| arduousness(noun, difficulty, discipline, toughness, strictness) |