Strong's G5227 — ὑπεναντίος (adjective)
hupenantios (hoop-en-an-tee'-os) adj.
1. under (covertly) contrary to, i.e. opposed or (as noun) an opponent
[from G5259 and G1727]
KJV: adversary, against 
Root(s): G5259, G1727 
Hebrew root: ἐναντίος
Occurrences: 2