| pith(noun, health, force, power, strength) |
| verve(noun, go, power, strength, energy) |
| assiduity |
| balls |
| boldness(noun, strength, spirit, determination, resolution) |
| bravery(noun, strength, spirit, determination, resolution) |
| decisiveness(noun, resolution) |
| gumption(noun, energy, vigor, vitality, dynamism) |
| gutsiness(noun, strength, energy, ability, vigor) |
| heartiness(noun, resolution) |
| intestinal fortitude(noun, expression, strength, energy, ability) |
| lastingness(noun, strength, resolution, fortitude, perseverance) |
| lustihood |
| pep(noun, activity, go, style, drive) |
| potential(noun, strain, vigor, liveliness, effort) |
| pressure(noun, strain, vigor, liveliness, effort) |
| push(noun, style, strain, effort, spark) |
| sedulousness |
| constancy(noun, strength, resolve, restraint, determination) |
| courageousness(noun, strength, determination, resolution, courage) |