| asperity(noun, severity, harshness, conformity, strictness) |
| heartlessness(noun, insensitivity, coldness) |
| inflexibility(noun, firmness, protection, severity, security) |
| insensitivity(noun, insensitivity, coldness) |
| obduracy(noun, severity, harshness, conformity, strictness) |
| ruggedness |
| ruthlessness(noun, cruelty, harshness, insensitivity, sternness) |
| stringency(noun, easy, condition, discipline, firmness) |
| sturdiness(noun, support, control, change, strength) |
| consistency(noun, density, texture, thickness, impermeability) |
| grimness(noun, discipline, firmness, severity, harshness) |
| hardship(noun, abuse, difficulty, misery, suffering) |
| insensibility |
| insensitiveness(noun, insensitivity) |
| obstinacy(noun, tenacity) |
| remorselessness(noun, cruelty, impenitence) |
| soundness(noun, support, control, change, strength) |
| stability(noun, support, control, change, strength) |
| sternness(noun, easy, condition, discipline, firmness) |
| stoniness(noun, insensitivity, coldness) |