There are various synonyms for the phrase "absence of voice." Some of these include mute, silent, voicelessness, wordlessness, dumbness, quiet, stillness, hush, noiselessness, and soundlessness. Each of these terms conveys different nuances and shades of meaning. For instance, "mute" typically refers to the inability to speak or produce sound, while "silence" often suggests a deliberate decision not to speak or communicate. "Voicelessness" and "wordlessness" both connote a lack of expression or communication, but the former carries a stronger sense of helplessness or powerlessness. In any case, each of these synonyms can be used to convey the idea of a lack of voice or communication.