Activity, Air, Animation, Application, Ardor, Backbone, Birr, Boldness, Bounce, Breath, Brio, Character, Complexion, Courage, Dash, Dauntlessness, Disposition, Earnestness, Elan, Energy, Enterprise, Enthusiasm, Drive, Effectiveness, Efficacy, Efficiency, Endurance, Pep, Ginger, Esprit, Essence, Fire, Force, Frame of mind, Gameness, Grit, Guts, Heart, Humor, Jazz, Life, Life force, Liveliness, Mettle, Mood, Morale, Motivation, Nerve, Oomph, Outlook, Pertness, Exertion, Forcefulness, Fortitude, Get-up-and-go, Go, Hardihood, Initiative, Intensity, Juice, Might, Muscle, Pizzazz, Psyche, Quality, Resolution, Resolve, Sparkle, Spunk, Stoutheartedness, Substance, Temper, Temperament, Tenor, Verve, Vigor, Vim, Vitality, Vivaciousness, Vivacity, Warmth, Will, Willpower, Zest, Zip, Pluck, Potency, Power, Puissance, Punch, Spirit, Spontaneity, Sprightliness, Stamina, Steam, Strength, Toughness, Tuck, Vehemence, Virility, Zeal, Zing