The DICT Development Group

  Voiceless \Voice"less\, a.
     1. Having no voice, utterance, or vote; silent; mute; dumb.
        [1913 Webster]
  
              I live and die unheard,
              With a most voiceless thought, sheathing it as a
              sword.                                --Byron.
        [1913 Webster]
  
     2. (Phon.) Not sounded with voice; as, a voiceless consonant;
        surd.
        [1913 Webster]
  
     Voiceless stop (Phon.), a consonant made with no audible
        sound except in the transition to or from another sound; a
        surd mute, as p, t, k.
        [1913 Webster] -- Voice"less*ly, adv. --
        Voice"less*ness, n.
        [1913 Webster]