| contumacy(noun, perseverance, obstinacy, stubbornness, inflexibility) |
| cruelty(noun, malice, meanness, nastiness, vindictiveness) |
| doggedness(noun, perseverance, obstinacy, stubbornness, inflexibility) |
| harshness(noun, ruthlessness, pitilessness, mercilessness, relentlessness) |
| indomitability(noun, perseverance, obstinacy, stubbornness, inflexibility) |
| malice(noun, cruelty, meanness, nastiness, vindictiveness) |
| mercilessness(noun, cruelty, malice, meanness, nastiness) |
| mulishness(noun, perseverance, obstinacy, stubbornness, inflexibility) |
| obstinacy(noun, perseverance, stubbornness, inflexibility, rigor) |
| pertinacity(noun, perseverance, obstinacy, stubbornness, inflexibility) |
| pigheadedness(noun, perseverance, obstinacy, stubbornness, inflexibility) |
| rancor |
| rancour |
| resentfulness |
| resentment(noun, cruelty, malice, meanness, nastiness) |
| revenge(noun, cruelty, malice, meanness, nastiness) |
| rigor(noun, obstinacy, stubbornness) |
| ruthlessness(noun, cruelty, malice, meanness, nastiness) |
| vindictiveness(noun, cruelty, malice, meanness, nastiness) |
| acerbity |