Strong’s Greek
G1422 — duskolos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
δύσκολος
duskolos — pronounced doo'-kol-os
from 1418 and kolon (food); properly, fastidious about eating (peevish), i.e. (genitive case) impracticable:--hard. see GREEK for 1418
1 occurrence in the KJV.
Mark 10:24
And the disciples were astonished at his words. But Jesus answereth again, and saith unto them, Children, how hard is it for them that trust in riches to enter into the kingdom of God!