Frolicsome (adjective)

1. Full of playfulness and lighthearted merriment.
2. Playful, mischievous, and full of energy.

Origin:

From middle english frolikesome, from old english frolīcsum 'full of mirth, playful'.

Examples:

1. The children were in a frolicsome mood, chasing each other around the park and laughing.
2. The frolicsome dog jumped up and down, eager to play with its owner.
3. The frolicsome dolphins danced in the waves, delighting the tourists on the boat.
4. The frolicsome mood at the party was contagious, and soon everyone was dancing and laughing.
5. The frolicsome kittens tumbled and played with each other, their playful antics bringing a smile to everyone's face.