Resembling brass in color or sound; bold and brazen, or made from or containing brass.
From 'brass' + the adjective suffix -y, creating a descriptive word meaning 'having the qualities of brass' or 'resembling brass.'
A 'brassy' person is bold like brass is shiny—there's something unmistakable and attention-getting about both of them, which is why the personality trait stuck to the word!
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