| constancy(noun, resolve, determination, resolution, steadfastness) |
| diligence(noun, resolve, determination, firmness, persistence) |
| dogmatism(severity, harshness, strictness, obstinacy, stubbornness) |
| grit(noun, resolve, determination, firmness, persistence) |
| hardness of heart(expression, idiom, malevolence, impenitence) |
| inclemency(severity, harshness, conformity, strictness, sternness) |
| inflexibleness(noun, state, quality, resist, perseverance) |
| intolerance(severity, harshness, conformity, strictness, conservatism) |
| intractability(noun, resistance, obstinacy, stubbornness, inflexibility) |
| mulishness(noun, determination, perseverance, obstinacy, stubbornness) |
| obstinateness(noun, obstinacy) |
| perversity |
| pigheadedness(noun, determination, perseverance, obstinacy, stubbornness) |
| rigidness(noun, state, quality, resist, perseverance) |
| rigour |
| self-control |
| strength(noun, resolve, resolution, inflexibility) |
| adamancy(noun, determination, perseverance, obstinacy, stubbornness) |
| apathy |
| application(noun, resolve, determination, firmness, persistence) |