muted in WordNet English dictionary

1. 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"
   dull  muffled  muted  softened 
   
2. in a softened tone
   "hushed voices"; "muted trumpets"; "a subdued whisper"; "a quiet reprimand"
   hushed  muted  subdued  quiet 
   

muted in English Wiktionary