If something is sprightlier, it is more lively and full of energy.
Sprightlier is a happy and positive word. It makes people think of fun and excitement.
Examples:
The puppy is sprightlier than the old dog.
She feels sprightlier in the morning.
The sprightlier music made everyone want to dance.
The sprightlier flowers seemed to be dancing in the wind.
After the nap, the baby was sprightlier than ever.
The sprightlier squirrel was jumping from tree to tree.