having an impediment in his speech

Strong’s Dictionary of Greek Words:

Number:
3424 (find all occurrences in KJV Bible)
Greek:
μογιλάλος
Transliteration:
mogilalos
Phonic:
mog-il-al’-os
Meaning:
from 3425 and 2980; hardly talking, i.e. dumb (tongue-tied)
KJV Usage:
having an impediment in his speech