Strongs: G880
G880 @ ἄφωνος aphōnos af'-o-nos From G1 (as a negative particle) and G5456 voiceless that is mute (by nature or choice); figuratively unmeaning: - dumb without signification.
Acts:8:32
1Corinthians:12:2
1Corinthians:14:10
Hebrews:12:28
2Peter:2:16