Superlative form of brassy; the most bold, loud, or having the most brazen confidence.
From 'brassy' (resembling brass or showing brass-like qualities) + the superlative suffix -est, making it the strongest form of the comparison.
The superlative 'brassiest' perfectly captures something about brass itself—the metal has this loud, attention-grabbing quality, so calling a bold person 'brassy' transfers all that shine and noise to describe their personality!
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