Definition of "unvoiced"

unvoiced

/ˌʌnˈvɔɪst/

adjective
not comparable
1. Not spoken or expressed.
2. (linguistics) Spoken without vibration of the vocal chords.
3. (signal processing, of a signal) That does not contain voice.
  Quotations
  The unvoiced signal is smaller energy than voiced signal and, so, this section is applied the smaller threshold.
  1999, ISIE ...‎, volumes 1-3, IEEE Service Center
4. (Internet) Of an IRC user: not granted voice privileges.