The Oxford Thesaurus An A-Z Dictionary of Synonyms - muteadj.

1) silent, dumb, speechless, voiceless, wordless, tight-lipped, taciturn, tacit, reserved, quiet, Colloq mum: Though I persisted in asking his name, he remained mute. 2) unspoken, unsaid, tacit, silent: The stain on the floor was a mute reminder of the crime. --v. 3) deaden, silence, muffle, stifle, dampen, damp, subdue, suppress, quiet or Brit also quieten, hush, soft-pedal, turn down, tone down: The carpet muted her footsteps as she crept up behind him.