voiceless in WordNet English dictionary

1. being without sound through injury or illness and thus incapable of all but whispered speech
   aphonic  voiceless 
   
2. uttered without voice
   "could hardly hear her breathed plea, `Help me'"; "voiceless whispers"
   breathed  voiceless 
   
3. deprived of the rights of citizenship especially the right to vote
   "labor was voiceless"; "disenfrenchised masses took to the streets"
   disenfranchised  disfranchised  voiceless  voteless 
   
4. produced without vibration of the vocal cords
   "unvoiced consonants such as `p' and `k' and `s'"
   unvoiced  voiceless  surd  hard