| sobriety(noun, restraint, discipline, willpower, discretion) |
| spine(noun, resolve, courage, purpose, fortitude) |
| spirit(noun, drive, resolve, determination, courage) |
| spunk(noun, resolve, courage, purpose, fortitude) |
| stability(noun, restraint, discipline, willpower, discretion) |
| stamina(courage, fortitude, backbone) |
| steadfastness(noun, resolve, courage, purpose, fortitude) |
| stiff upper lip(noun, expression, idiom, resolve, purpose) |
| stoicism(noun, restraint, discipline, willpower, discretion) |
| strength of mind(noun, expression, idiom, resolve, discipline) |
| strength of will(expression, idiom, discipline, willpower, self-discipline) |
| strongmindedness(fortitude, stamina, backbone) |
| stubbornness(noun, resolve, purpose, fortitude, grit) |
| temperament(noun, drive, resolve, determination, motivation) |
| tenacity(noun, resolve, courage, purpose, fortitude) |
| urge(noun, drive, resolve, determination, motivation) |
| valor(noun, resolve, purpose, fortitude, grit) |
| velleity(noun, drive, resolve, determination, motivation) |
| virtue |
| volition(noun, drive, resolve, determination, motivation) |