noun (n)

• the condition of being unable or unwilling to speak(noun.state)

  Example:
  Her muteness was a consequence of her deafness.
  

  Synonym:
  mutism
  

  source: wordnet30
• a refusal to speak when expected(noun.attribute)

  Synonym:
  silence
  

  source: wordnet30
• The quality or state of being mute; speechlessness.(noun)

  source: webster1913