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Noun: lightsomeness  lIt-sum-nus
  1. The cheerful feeling you have when nothing is troubling you
    - carefreeness, insouciance, lightheartedness
  2. The gracefulness of a person or animal that is quick and nimble
    - agility, legerity, lightness, nimbleness
  3. The trait of being lighthearted and frivolous
    - lightness

Type of: blitheness, cheerfulness, giddiness, gracefulness, silliness