Activity • Apathetic • Becoming • Breaks • Capacity • Causing • Depleted • Describes • Disinterested • Done • Dormant • Endure • Energy • Everlasting • Exertion • Exhausting • Fatigue • Getting • High • Lacking • Lethargic • Machine • Maintain • Needing • Never • Person • Physical • Possesses • Quality • Refers • Requiring • Rest • Showing • Signs • Sluggish • Someone • Stamina • Their • Time • Tired • Tireless • Tirelessly • Unfailing • Unflagging • Unlimited • Untiring • Wearisome • Which • Withstand • Word