voice·less / ˈvoislis/ • adj. mute; speechless: how could he have remained voiceless in the face of her cruelty? ∎ not expressed: the air was charged with voiceless currents of thought. ∎ (of a person or group) lacking the power or right to express an opinion or exert control over affairs. ∎ Phonet. (of a speech sound) uttered without resonance of the vocal cords, e.g., f as opposed to v, p as opposed to b, and s as opposed to z.DERIVATIVES: voice·less·ly adv.voice·less·ness n.