Strong’s Greek
G101 — adunateo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἀδυνατέω
adunateo — pronounced ad-oo-nat-eh'-o
from 102; to be unable, i.e. (passively) impossible:--be impossible. see GREEK for 102
2 occurrences in the KJV.
Matthew 17:20
And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.
Luke 1:37
For with God nothing shall be impossible.