From The Collaborative International Dictionary of English v.0.48 [gcide]:
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]
From WordNet (r) 3.0 (2006) [wn]:
voiceless
adj 1: produced without vibration of the vocal cords; "unvoiced
consonants such as `p' and `k' and `s'" [syn: unvoiced,
voiceless, surd, hard] [ant: soft, sonant,
voiced]
2: deprived of the rights of citizenship especially the right to
vote; "labor was voiceless"; "disenfrenchised masses took to
the streets" [syn: disenfranchised, disfranchised,
voiceless, voteless] [ant: enfranchised]
3: uttered without voice; "could hardly hear her breathed plea,
`Help me'"; "voiceless whispers" [syn: breathed,
voiceless]
4: being without sound through injury or illness and thus
incapable of all but whispered speech [syn: aphonic,
voiceless]