Pronunciation: (vois'lis), [key]
1. having no voice; mute.
2. uttering no words; silent.
3. having an unmusical voice.
4. unspoken; unuttered: voiceless sympathy.
5. having no vote or right of choice.
6. Phonet.(of a speech sound)
a. without voice; unvoiced; surd; aphonic (contrasted with voiced): “p,” “f,” and “s” are voiceless.
b. uttered without phonation.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.