| force(noun, body, power, strength, energy) |
| guts(noun, strength, energy, spirit, determination) |
| gutsiness(noun, strength, heart, wind, sturdiness) |
| heartiness(noun, resolution) |
| lustiness(noun, health, force, body, power) |
| mettle(noun, spirit, determination, courage, boldness) |
| persistence(noun, strength, determination, resolution, firmness) |
| potency(noun, health, force, body, power) |
| resistance(noun, spirit, firmness, protection, security) |
| rigor(noun, easy, condition, discipline, firmness) |
| soundness(noun, health, support, control, force) |
| spirit(noun, power, strength, energy, vigor) |
| stickiness(tenacity, coherence) |
| stoniness(noun, resolution, insensitivity) |
| strength of character(noun, expression, idiom, hard, power) |
| strenuousness(noun, difficulty, hardness, tedium, arduousness) |
| tightness(noun, difficulty) |
| ability to bounce back(noun, hard, power, strength, flexibility) |
| adaptability(noun, hard, power, strength, flexibility) |
| boldness(noun, spirit, resolution, courage, pluck) |