Adjectives

(s)light, lightsome, trippingmoving easily and quickly; nimble“the dancer was light and graceful”, “a lightsome buoyant step”, “walked with a light tripping step”
(s)blithe, blithesome, lighthearted, lightsome, light-heartedcarefree and happy and lighthearted“was loved for her blithe spirit”, “a merry blithesome nature”, “her lighthearted nature”, “trilling songs with a lightsome heart”