1) Aphonia 2) Defect of speech 3) Speech defect 4) Speech disorder 1) Aphonia 
In linguistics, voicelessness is the property of sounds being pronounced without the larynx vibrating. Phonologically, this is a type of phonation, which contrasts with other states of the larynx, but some object that the word `phonation` implies voicing, and that voicelessness is the lack of phonation. The International Phonetic Alphabet has di.....
voicelessness 1. Being voiceless through injury or illness and thus incapable of all but whispered speech. 2. A disorder of the vocal organs that results in the loss of the voice.
noun having no voice in the management or control of affairs; `the voicelessness of those who live in situations of hopelessness`