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Adjective: lighthearted  'lIt'haa(r)-tid
  1. Carefree and happy and lighthearted
    "her lighthearted nature";
    - blithe, blithesome [archaic], lightsome, light-hearted, playful, unserious
Adverb: light-heartedly  'lIt'haa(r)-tid-lee
  1. In a light-hearted manner
    "he light-heartedly overlooks some of the basic facts of life";
    - lightsomely

See also: cheerful