Talking foolishly or nonsensically; often used as a mild insult to describe someone who is not making sense.
From 'blither,' which comes from Old Norse 'blīðra' meaning cheerful, but the meaning shifted to describe empty, foolish chatter. It's primarily used in British English.
The phrase 'blithering idiot' became famous from Basil Fawlty's rants on the British sitcom 'Fawlty Towers'—the word perfectly captures frustrated exasperation without being too harsh!
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