| fearlessness(noun, spirit, determination, courage, firmness) |
| firmness(noun, spirit, resolve, determination, confidence) |
| fitness(noun, strength) |
| forbearance(noun, restraint, capacity, fortitude, composure) |
| forcefulness(noun, power, strength, energy, resolve) |
| gumption(noun, drive, power, strength, energy) |
| hardihood(noun, spirit, resolve, determination, courage) |
| heart of oak(expression, idiom) |
| heartiness |
| humility(noun, restraint, capacity, fortitude, composure) |
| imperturbability(noun, restraint, capacity, fortitude, composure) |
| inflexibility(noun, resolve, determination, firmness, persistence) |
| intransigence(noun, resolve, determination, firmness, persistence) |
| intrepidity(noun, spirit, resolve, determination, courage) |
| lastingness(noun, strength, resolution, fortitude, stamina) |
| legs(strength, energy, vigor, restraint, capacity) |
| leniency(noun, restraint, capacity, composure, stamina) |
| long-suffering(noun, restraint, capacity, fortitude, composure) |
| longanimity(noun, restraint, capacity, fortitude, composure) |
| lustihood |