| stamina(noun, quality, power, strength, energy) |
| perseverance |
| endurance(noun, quality, power, strength, energy) |
| fortitude(noun, strength, energy, spirit, vigor) |
| patience(noun, strength, restraint, determination, resolution) |
| guts(noun, strength, energy, spirit, informal) |
| backbone(noun, strength, energy, informal, restraint) |
| resolution(noun, strength, determination, courage, firmness) |
| strength(noun, energy, vigor, resolution, courage) |
| grit(noun, strength, energy, restraint, determination) |
| gutsiness(noun, strength, energy, vigor, restraint) |
| indefatigability(noun, strength, energy, vigor, vitality) |
| intestinal fortitude(noun, expression, strength, energy, vigor) |
| persistence(noun, strength, restraint, resolution, capacity) |
| tenacity(noun, strength, spirit, determination, resolution) |
| tolerance(noun, strength, energy, vigor, restraint) |
| toughness(noun, strength, energy, heart, wind) |
| vitality(noun, strength, energy, vigor, resolution) |
| diligence(noun, restraint, capacity, fortitude, composure) |
| doggedness(noun, strength, energy, spirit, determination) |