"lightsome" in the adjective sense
1. light, lightsome, tripping
moving easily and quickly nimble
"the dancer was light and graceful"
"a lightsome buoyant step"
"walked with a light tripping step"
2. blithe, blithesome, lighthearted, lightsome, light-hearted
carefree and happy and lighthearted
"was loved for her blithe spirit"
"a merry blithesome nature"
"her lighthearted nature"
"trilling songs with a lightsome heart"
Source: WordNet® (An amazing lexical database of English)
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