voiceless

produced without vibration of the vocal cords; "unvoiced consonants such as `p' and `k' and `s'"

deprived of the rights of citizenship especially the right to vote; "labor was voiceless"; "disenfrenchised masses took to the streets"

uttered without voice; "could hardly hear her breathed plea, `Help me'"; "voiceless whispers"

being without sound through injury or illness and thus incapable of all but whispered speech