Vine's Expository Dictionary: View Entry
TDNT Reference: 6:174,849
ἀπιστέω apistéō, ap-is-teh'-o; from G571; to be unbelieving, i.e. (transitively) disbelieve, or (by implication) disobey:—believe not.
The KJV translates Strong's G569 in the following manner: believe not (7x).
to betray a trust, be unfaithful
to have no belief, disbelieve
Strong's Number G569 matches the Greek ἀπιστέω (apisteō),
which occurs 7 times in 7 verses
in the TR Greek.