| mettle(noun, strength, spirit, ability, resolve) |
| toughness(noun, strength, spirit, determination, heart) |
| boldness(noun, spirit, resolve, determination, courage) |
| bravery(noun, spirit, resolve, determination, confidence) |
| determination(noun, drive, power, strength, energy) |
| gut |
| guttiness(noun, resolve, determination, firmness, persistence) |
| hardiness(noun, strength, energy, spirit, determination) |
| manhood |
| might(noun, power, strength, energy, spirit) |
| obstinacy(noun, resolve, determination, firmness, stubbornness) |
| potency(noun, power, strength, energy, vigor) |
| power(noun, strength, energy, vigor, might) |
| robustness(strength, toughness, sturdiness) |
| sand(resolve, determination, courage, firmness, nerve) |
| starch(noun, strength, energy, spirit, ability) |
| sturdiness(strength, toughness) |
| vitality(noun, strength, energy, ability, vigor) |
| ability(noun, drive, power, strength, energy) |
| application(noun, resolve, determination, firmness, persistence) |