Strong's #1769: enneos (pronounced en-neh-os')
from 1770; dumb (as making signs), i.e. silent from astonishment:--speechless.
Thayer's Greek Lexicon:
̓́
enneos
1) dumb, mute, destitute of power of speech
2) unable to speak for terror, struck dumb, astounded
Part of Speech: adjective
Relation: from G1770
Usage:
This word is used 1 times:
Acts 9:7: "which journeyed with him stood speechless, hearing a voice, but"