| rigidness(noun, state, quality, resist, perseverance) |
| adamancy(noun, perseverance, obstinacy, stubbornness, inflexibility) |
| contumacy(noun, perseverance, obstinacy, stubbornness, inflexibility) |
| doggedness(noun, perseverance, obstinacy, stubbornness, inflexibility) |
| indomitability(noun, perseverance, obstinacy, stubbornness, inflexibility) |
| mulishness(noun, perseverance, obstinacy, stubbornness, inflexibility) |
| pertinacity(noun, perseverance, obstinacy, stubbornness, inflexibility) |
| stiffness |
| toughness |
| callousness(ruthlessness, pitilessness, mercilessness) |
| cold-bloodedness(ruthlessness, pitilessness, mercilessness, relentlessness) |
| cold-heartedness(ruthlessness, pitilessness, mercilessness) |
| dogmatism(obstinacy, stubbornness, rigor) |
| hardheartedness(ruthlessness, pitilessness, mercilessness) |
| harshness(ruthlessness, pitilessness, mercilessness, relentlessness) |
| heartlessness(ruthlessness, pitilessness, mercilessness, relentlessness) |
| mercilessness(ruthlessness, pitilessness, relentlessness) |
| obdu(stubbornness, inflexibility, intransigence, inexorability) |
| persistence |
| pitilessness(ruthlessness, mercilessness, relentlessness) |