voiceless

adj.无声的

viz, vizier, vocabulary, vocal, vocal cords, vocalist, vocalize, vocalise, vocally, vocation, vocational, vocative, vociferate, vociferous, vociferously, vodka, vogue, vogue-word, voice, voice-box, voice-over, void, voile, vol, vol-au-vent, volatile, volatility, volcanic, volcano, vole, volition, volitional, volley, volley-ball, volleyball, volt, voltage, volte-face, volubility, voluble, volubly,