believe(-ing, -r), faithful(-ly), sure, true

Strong’s Dictionary of Greek Words:

Number:
4103 (find all occurrences in KJV Bible)
Greek:
πιστός
Transliteration:
pistos
Phonic:
pis-tos’
Meaning:
from 3982; objectively, trustworthy; subjectively, trustful
KJV Usage:
believe(-ing, -r), faithful(-ly), sure, true