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Synonyms for Brassy (same or very similar meaning)

WordNet sense 1 (resembling the sound of a brass instrument):
brasslike

WordNet sense 2 (tastelessly showy):
cheap, flash, flashy, garish, gaudy, gimcrack, loud, meretricious, tacky, tawdry, trashy, tatty

WordNet sense 3 (lacking aesthetic or social taste):
tasteless

WordNet sense 4 (unrestrained by convention or propriety):
audacious, barefaced, bodacious, brazen, insolent, brazen-faced, bald-faced

WordNet sense 5 (used of persons or their behavior; feeling no shame):
unashamed


From the ODE community, based on WordNetadd/edit