having no voice; mute.

uttering no words; silent.

having an unmusical voice.

unspoken; unuttered

voiceless sympathy.

having no vote or right of choice.

Phonetics . (of a speech sound)

without voice; unvoiced; surd; aphonic ( contrasted with voiced )

p, f, and s are voiceless.

uttered without phonation.

adjective

aphonic , inarticulate , mute , speechless , dumb , mum , silent , wordless , inaudible , surd