| middle(noun, emotion, mood, temperament, core) |
| muscle(noun, health, force, body, power) |
| nerves |
| nerviness(noun, state, quality, attitude, face) |
| pith(noun, health, force, body, power) |
| pluckiness(noun, quality, spirit, dash, fear) |
| rally(verb, encourage, raise, stimulate, prepare) |
| self-confidence(noun, drive, energy, resolve, determination) |
| self-importance(noun, scorn, disdain, pride, boldness) |
| side |
| stability(noun, health, force, body, power) |
| stiffen(verb, close, set, fix, settle) |
| stomach(noun, strength, spirit, resolve, informal) |
| sustain(verb, strength) |
| temper(noun, verb, close, set, force) |
| toughen(verb, close, set, fix, settle) |
| vitality(noun, health, force, quality, body) |
| élan(noun, force, quality, feeling, power) |
| affectionateness |
| aggressiveness(noun, confidence, self-possession, self-confidence, self-reliance) |