Strong’s Greek
G1374 — dipsuchos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
δίψυχος
dipsuchos — pronounced dip'-soo-khos
from 1364 and 5590; two-spirited, i.e. vacillating (in opinion or purpose):--double minded. see GREEK for 1364 see GREEK for 5590
2 occurrences in the KJV.
James 1:8
A double minded man is unstable in all his ways.
James 4:8
Draw nigh to God, and he will draw nigh to you. Cleanse your hands, ye sinners; and purify your hearts, ye double minded.