The Collaborative International Dictionary of English v.0.48:
Muteness \Mute"ness\, n. The quality or state of being mute; speechlessness. [1913 Webster]WordNet (r) 3.0 (2006):
muteness n 1: the condition of being unable or unwilling to speak; "her muteness was a consequence of her deafness" [syn: mutism, muteness] 2: a refusal to speak when expected; "his silence about my contribution was surprising" [syn: muteness, silence]