1. blithe, unconcerned (vs. concerned)

usage: lacking or showing a lack of due concern; "spoke with blithe ignorance of the true situation"

2. blithe, blithesome, lighthearted, lightsome, light-hearted, cheerful (vs. depressing)

usage: 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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See also: blithe (Dictionary)