noun (n)

• a disorder of the vocal organs that results in the loss of voice(noun.state)

  Synonym:
  aphonia
  

  source: wordnet30
• speaking softly without vibration of the vocal cords(noun.communication)

  Synonym:
  susurration, whisper, whispering
  

  source: wordnet30
• having no voice in the management or control of affairs(noun.attribute)

  Example:
  The voicelessness of those who live in situations of hopelessness.
  

  source: wordnet30