What is the meaning of voiceless?

adjective

• Produced without vibration of the vocal cords.
  • usage: "unvoiced consonants such as `p' and `k' and `s'"
  • synonyms: unvoiced, surd, hard
• Deprived of the rights of citizenship especially the right to vote.
  • usage: "labor was voiceless"; "disenfrenchised masses took to the streets"
  • synonyms: disenfranchised, disfranchised, voteless
• Uttered without voice.
  • usage: "could hardly hear her breathed plea, `Help me'"; "voiceless whispers"
  • synonyms: breathed
• Being without sound through injury or illness and thus incapable of all but whispered speech.
  • synonyms: aphonic