| inflexibility(ruthlessness, pitilessness, mercilessness) |
| inflexibleness(ruthlessness, pitilessness, mercilessness) |
| inhumanity(cruelty, viciousness) |
| intransigence(ruthlessness, pitilessness, mercilessness) |
| intransigency(ruthlessness, pitilessness, mercilessness) |
| maliciousness(cruelty, coldness, viciousness, hardheartedness, pitilessness) |
| mercilessness(cruelty, coldness, viciousness, hardheartedness, ruthlessness) |
| mulishness(ruthlessness, pitilessness, mercilessness) |
| obduracy(ruthlessness, pitilessness, mercilessness) |
| obdurateness(ruthlessness, pitilessness, mercilessness) |
| obstinacy(ruthlessness, pitilessness, mercilessness) |
| pertinacity(ruthlessness, pitilessness, mercilessness) |
| pigheadedness(ruthlessness, pitilessness, mercilessness) |
| pitilessness(insensitivity, coldness, hardheartedness, ruthlessness, mercilessness) |
| relentlessness(ruthlessness, pitilessness, mercilessness) |
| remorselessness(noun, cruelty, coldness, hardheartedness, ruthlessness) |
| remoteness(noun, coldness, unfriendliness, taciturnity) |
| reserve(noun, coldness, iciness) |
| rigidity(ruthlessness, pitilessness, mercilessness) |
| rigidness(ruthlessness, pitilessness, mercilessness) |