dumbness

Short definition from Wiktionary

Noun

1. 1
   The state of being mute: that is, of not communicating vocally, whether from selective mutism (refusal to speak) or from an inability to speak.
2. 2
   Muteness, silence; abstention from speech.
3. 3
   Show or gesture without words; pantomime; dumb-show.
4. 4
   The quality of being stupid or foolish.