Strong’s Greek
G1569 — ekthambos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἔκθαμβος
ekthambos — pronounced ek'-tham-bos
from 1537 and 2285; utterly astounded:--greatly wondering. see GREEK for 1537 see GREEK for 2285
1 occurrence in the KJV.
Acts 3:11
And as the lame man which was healed held Peter and John, all the people ran together unto them in the porch that is called Solomon’s, greatly wondering.