| rigour |
| staunchness(noun, resolve, determination, resolution, firmness) |
| sternness(firmness, severity, harshness, conformity, strictness) |
| strictness(noun, resolve, resolution, firmness, severity) |
| bullheadedness(noun, determination, perseverance, obstinacy, stubbornness) |
| die-hardism(noun, state, quality, resist, perseverance) |
| formality(firmness, severity, strictness, rigidity, sternness) |
| immobility(firmness, rigidity, stiffness) |
| immutability |
| implacableness(noun, state, quality, resist, perseverance) |
| inexorableness(noun, state, quality, resist, perseverance) |
| purposefulness(noun, resolve, determination, resolution, firmness) |
| resolve(noun, determination, resolution, firmness, persistence) |
| contrariness(noun, obstinacy) |
| decision |
| diligence(noun, resolve, determination, firmness, persistence) |
| exactness(severity, harshness, conformity, strictness, sternness) |
| fixity(noun, resolve, resolution) |
| flintiness |
| grit(noun, resolve, determination, firmness, persistence) |