| inclemency(severity, strictness, sternness) |
| incorruptibility(fortitude, stamina, backbone) |
| inflexibility(severity, strictness, sternness) |
| inhibition(noun, control, command, caution, constraint) |
| intestinal fortitude(expression, courage, fortitude, stamina) |
| iron will(expression, resolve, determination) |
| itch(noun, will, tear-jerker) |
| judiciousness(sobriety, self-denial) |
| keening(noun, will, tear-jerker) |
| lamentation(noun, will, tear-jerker) |
| limitation(noun, control, command, caution, constraint) |
| mind(noun, feeling, drive, power, character) |
| moral courage(expression, fortitude, stamina, backbone) |
| moral excellence(expression, fortitude, stamina, backbone) |
| moral fiber(expression, courage, fortitude, stamina, backbone) |
| moral fibre |
| moral rectitude(expression, fortitude, stamina, backbone) |
| moral virtue(expression, fortitude, stamina, backbone) |
| morality(fortitude, stamina, backbone) |
| motivation(noun, drive, resolve, determination, willpower) |