Meaning

verb to talk foolishly

adjective lacking or showing a lack of due concern

adjective carefree and happy and lighthearted

originThe verb is a variant of blether (Northern England, Scotland), blather (“to say (something foolish or nonsensical); to say (something) in a foolish or overly verbose way; to babble (something); to talk rapidly without making much sense; to cry loudly, blubber”), from Middle English bloderen, blotheren (“to babble; to cry loudly, blubber”), from Old Norse blaðra (“to talk foolishly or…

Etymology from Wiktionary, CC BY-SA 3.0