Strong’s Greek
G1630 — ekphobos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἔκφοβος
ekphobos — pronounced ek'-fob-os
from 1537 and 5401; frightened out of one's wits: sore afraid, exceedingly fear. see GREEK for 1537 see GREEK for 5401
2 occurrences in the KJV.
Mark 9:6
For he wist not what to say; for they were sore afraid.
Hebrews 12:21
And so terrible was the sight, that Moses said, I exceedingly fear and quake:)