| fervency(noun, resolution) |
| fire(noun, force, quality, character, strength) |
| firm-ness(noun, drive, energy, resolve, determination) |
| fixed purpose(noun, expression, spirit, determination, firmness) |
| force(noun, quality, character, strength, spirit) |
| frame of mind(noun, expression, idiom, force, quality) |
| ginger(noun, force, character, spirit) |
| greatheartedness |
| gumption |
| headstrongness(noun, resolution) |
| heartiness(noun, resolution) |
| humor(noun, force, quality, character, strength) |
| immovability(noun, spirit, determination, firmness, decision) |
| independence(noun, drive, energy, resolve, determination) |
| intent(noun, spirit, determination, firmness, decision) |
| intention(noun, spirit, determination, firmness, decision) |
| intestinal fortitude(expression, resolve, determination, courage, nerve) |
| jazz(noun, force, quality, character, strength) |
| life(noun, force, quality, character, strength) |
| life force(noun, expression, force, quality, character) |