Strong's G880 — ἄφωνος (adjective)
aphonos (af'-o-nos) adj.
1. voiceless, i.e. mute (by nature or choice)
2. (figuratively) meaningless
[from G1 (as a negative particle) and G5456]
KJV: dumb, without signification 
Root(s): G1, G5456 
Hebrew root: φωνή
Occurrences: 4