lightsome – adjective \ˈlīt-səm\

1.) moving easily and quickly; nimble
“a lightsome buoyant step”

Synonyms: light, tripping, light-footed (of movement) having a light and springy step

also means…
carefree and happy and lighthearted

“trilling songs with a lightsome heart”

Synonyms: blithe, blithesome, light-hearted, lighthearted, cheerful

via Vocabulary.com