Strong’s Greek
G172 — akakos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἄκακος
akakos — pronounced ak'-ak-os
from 1 (as a negative particle) and 2556; not bad, i.e. (objectively) innocent or (subjectively) unsuspecting:--harmless, simple. see GREEK for 1 see GREEK for 2556
2 occurrences in the KJV.
Romans 16:18
For they that are such serve not our Lord Jesus Christ, but their own belly; and by good words and fair speeches deceive the hearts of the simple.
Hebrews 7:26
For such an high priest became us, who is holy, harmless, undefiled, separate from sinners, and made higher than the heavens;