unvoiced in WordNet English dictionary

1. produced without vibration of the vocal cords
   "unvoiced consonants such as `p' and `k' and `s'"
   unvoiced  voiceless  surd  hard 
   
2. not made explicit
   "the unexpressed terms of the agreement"; "things left unsaid"; "some kind of unspoken agreement"; "his action is clear but his reason remains unstated"
   unexpressed  unsaid  unstated  unuttered  unverbalized  unverbalised  unvoiced  unspoken 
   

unvoiced in English Wiktionary