Showing a casual and cheerful indifference; carefree and lighthearted, often to the point of being thoughtless or unconcerned about serious matters.
From Old English 'blīthe' meaning 'joyous' or 'cheerful,' related to Old Norse 'blīðr' (gentle, mild). The word has maintained its core meaning of cheerfulness but developed a secondary sense of careless indifference.
Remember the phrase 'ignorance is bliss'—someone who is blithe is blissfully unaware of problems, like a person whistling happily while walking through a thunderstorm. Their cheerfulness comes from not paying attention to serious issues!
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