blithe -- (lacking or showing a lack of due concern; "spoke with blithe ignorance of the true situation")
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")
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