adjective
showing a casual and cheerful indifference considered to be callous or improper
adverb
in a carefree and lighthearted manner
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She greeted us with a blithe smile, unaware of the seriousness of the situation.
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He always has a blithe attitude, never letting anything bother him.
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She's so blithe, always living life to the fullest.
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His blithe disregard for the rules often gets him into trouble.