Synonyms for Lightsome (same or very similar meaning)
WordNet sense 1 (moving easily and quickly; nimble):
light, trippingWordNet sense 2 ((of movement) having a light and springy step):
light-footedWordNet sense 3 (carefree and happy and lighthearted):
blithe, blithesome, lighthearted, light-heartedFrom the ODE community, based on WordNetadd/edit