Blithe is a noun meaning cheerful and carefree in a way that can be lighthearted or heedless of potential consequences. It connotes a sunny, unconcerned attitude; historically it carried a sense of heedless happiness, often with an ironic undertone in literary contexts. The term is frequently used to describe mood or behavior rather than a physical state, and can imply both sincere buoyancy or dismissiveness depending on context.
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