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Adjective: blithe (blither,blithest)  blIth or blIdh [N. Amer], blIdh [Brit]
  1. Lacking or showing a lack of due concern
    "spoke with blithe ignorance of the true situation"
  2. Carefree and happy; not serious
    "was loved for her blithe spirit";
    - blithesome [archaic], lighthearted, lightsome, light-hearted, unserious, playful

Derived forms: blither, blithest

See also: cheerful, unconcerned

Encyclopedia: Blithe