Strong’s Greek
G869 — aphno
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἄφνω
aphno — pronounced af'-no
adverb from 852 (contraction); unawares, i.e. unexpectedly:--suddenly. see GREEK for 852
3 occurrences in the KJV.
Acts 2:2
And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting.
Acts 16:26
And suddenly there was a great earthquake, so that the foundations of the prison were shaken: and immediately all the doors were opened, and every one’s bands were loosed.
Acts 28:6
Howbeit they looked when he should have swollen, or fallen down dead suddenly: but after they had looked a great while, and saw no harm come to him, they changed their minds, and said that he was a god.