| relentlessness(harshness, sternness, ruthlessness, pitilessness, mercilessness) |
| remorselessness(noun, cruelty, coldness, ruthlessness, pitilessness) |
| remoteness(noun, coldness, unfriendliness, taciturnity) |
| resistance(firmness, rigidity, stiffness) |
| resoluteness(firmness, rigidity, stiffness) |
| rigidness(ruthlessness, pitilessness, mercilessness) |
| sadism(noun, torture, cruelty, harshness, malice) |
| savageness(noun, torture, cruelty, harshness, malice) |
| savagery(noun, torture, cruelty, harshness, malice) |
| scratchiness |
| security(firmness, rigidity, stiffness) |
| solidity(firmness, rigidity, stiffness) |
| spite(noun, torture, cruelty, harshness, malice) |
| spitefulness(noun, torture, cruelty, harshness, malice) |
| stability(firmness, rigidity, stiffness) |
| stoniness(noun, roughness, coldness, unfriendliness, taciturnity) |
| stubbornness(ruthlessness, pitilessness, mercilessness) |
| taciturnity(noun, coldness, unfriendliness) |
| torture(noun, cruelty, harshness, malice, unkindness) |
| truculence(noun, torture, cruelty, harshness, malice) |