| fearlessness(noun, drive, energy, resolve, determination) |
| fire(noun, force, quality, character, strength) |
| firm-ness(noun, drive, energy, resolve, determination) |
| fixed purpose(noun, expression, spirit, determination, resolution) |
| fixity(noun, resolve, determination) |
| forcefulness(noun, power, strength, energy, resolve) |
| fortitude(noun, drive, character, strength, energy) |
| frame of mind(noun, expression, idiom, force, quality) |
| gameness(noun, force, quality, character, strength) |
| hankering(noun, feeling, drive, power, character) |
| hardihood(noun, drive, energy, resolve, determination) |
| humor(noun, force, quality, character, strength) |
| immovability(noun, spirit, determination, firmness, decision) |
| inculcation(noun, control, training, strictness, self-control) |
| independence(noun, drive, energy, resolve, determination) |
| indoctrination(noun, control, training, strictness, self-control) |
| indomitability(noun, drive, energy, resolve, determination) |
| intent(noun, spirit, determination, firmness, decision) |
| intention(noun, feeling, drive, power, character) |
| intestinal fortitude(noun, expression, drive, power, strength) |