Bold and shameless in a way that shows no respect for others; impudent. Can also mean made of brass or having a brass-like appearance.
From Old English 'bræsen' meaning made of brass, from 'bræs' (brass). The figurative sense of 'shameless' developed from the idea that brass is hard and unfeeling, leading to the metaphor of having a 'brazen face.'
Think of brass instruments - they're LOUD and impossible to ignore, just like brazen behavior! A brazen person has a 'brass face' - hard, shiny, and shameless.
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