dull muffled muted softened
dull%5:00:00:soft:04 muffled%5:00:00:soft:04 muted%5:00:00:soft:04 softened%5:00:00:soft:04
being or made softer or less loud or clear
the dull boom of distant breaking waves muffled drums the muffled noises of the street muted trumpets