Strong’s Greek
G1365 — distazo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
διστάζω
distazo — pronounced dis-tad'-zo
from 1364; properly, to duplicate, i.e. (mentally) to waver (in opinion):--doubt. see GREEK for 1364
2 occurrences in the KJV.
Matthew 14:31
And immediately Jesus stretched forth his hand, and caught him, and said unto him, O thou of little faith, wherefore didst thou doubt?
Matthew 28:17
And when they saw him, they worshipped him: but some doubted.