adversary, against

Concise Bible Dictionary:

Strong’s Dictionary of Greek Words:

Greek:
ὑπεναντίος
Transliteration:
hupenantios
Phonic:
hoop-en-an-tee’-os
Meaning:
from 5259 and 1727; under (covertly) contrary to, i.e. opposed or (as noun) an opponent
KJV Usage:
adversary, against