Strong's G102 — ἀδύνατος (adjective)
adunatos (ad-oo'-nat-os) adj.
1. unable, i.e. weak
2. (passively) impossible
{literally or figuratively}
[from G1 (as a negative particle) and G1415]
KJV: could not do, impossible, impotent, not possible, weak 
Root(s): G1, G1415 
Hebrew root: δυνατός
Occurrences: 10