Strong’s Greek
G679 — aptaistos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἄπταιστος
aptaistos — pronounced ap-tah'-ee-stos
from 1 (as a negative particle) and a derivative of 4417; not stumbling, i.e. (figuratively) without sin:--from falling. see GREEK for 1 see GREEK for 4417
1 occurrence in the KJV.
Jude 1:24
Now unto him that is able to keep you from falling, and to present you faultless before the presence of his glory with exceeding joy,