When someone has spiritedness, they have a lot of energy and enthusiasm.
Having spiritedness is usually a good thing because it means someone is lively and full of life.
Examples:
Her spiritedness makes everyone happy.
The team showed a lot of spiritedness in the game.
I like her spiritedness when she sings.
The puppy's spiritedness is contagious.
His spiritedness is like a big, bright light.
The spiritedness of the children was like a storm of happiness.