| expectedness |
| fundamental(need, essential, requirement, prerequisite, essentiality) |
| godsend(need, essential, requirement, prerequisite, essentiality) |
| imperative(need, essential, requirement, prerequisite, essentiality) |
| inclemency |
| indispensability(need, essential, requirement, prerequisite, essentiality) |
| indomitability(perseverance, obstinacy, stubbornness, inflexibility, rigor) |
| inflexibleness(noun, state, quality, resist, perseverance) |
| life or death(expression, idiom, need, essential, requirement) |
| mulishness(perseverance, obstinacy, stubbornness, inflexibility, rigor) |
| must(need, essential, requirement, prerequisite, essentiality) |
| necessary(need, essential, requirement, prerequisite, essentiality) |
| need(essential, requirement, prerequisite, essentiality) |
| needfulness(need, essential, requirement, prerequisite, essentiality) |
| no alternative(expression, need, essential, requirement, prerequisite) |
| no choice(expression, need, essential, requirement, prerequisite) |
| obligation(need, essential, requirement, prerequisite, essentiality) |
| obstinacy(perseverance, stubbornness, inflexibility, rigor, ruthlessness) |
| pertinacity(perseverance, obstinacy, stubbornness, inflexibility, rigor) |
| pigheadedness(perseverance, obstinacy, stubbornness, inflexibility, rigor) |