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adj.
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"
adj.
altered to accommodate to certain requirements or bring into a proper relation; "an adjusted insurance claim"; "the car runs more smoothly with the timing adjusted"
adj.
characterized by soft sounds; "a murmurous brook"; "a soughing wind in the pines"; "a slow sad susurrous rustle like the wind fingering the pines"- R.P.Warren