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Adjective: lightsome  lIt-sum
  1. Moving easily and quickly; nimble
    "a lightsome buoyant step";
    - light, tripping
     
  2. Carefree and happy; not serious
    "trilling songs with a lightsome heart";
    - blithe, blithesome [archaic], lighthearted, light-hearted, playful, unserious

See also: cheerful, light-footed