adversary

An adversary is someone who fights against or opposes another. In tennis, you stand across the net from your adversary.

Adversary as in "enemy" or "opponent" is related to the words adversarial, or hostile, or adverse, meaning against or contrary. The Adversary is a specific reference to Satan, or the Devil. The word adversary is from Middle English adversarie, from Latin adversarius, from adversus "against."

Definitions of adversary
1

n someone who offers opposition

Synonyms:
antagonist, opponent, opposer, resister
Antonyms:
agonist
someone involved in a contest or battle (as in an agon)
Examples:
Antichrist
(Christianity) the adversary of Christ (or Christianity) mentioned in the New Testament; the Antichrist will rule the world until overthrown by the Second Coming of Christ
Types:
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dueler, duelist, dueller, duellist
a person who fights duels
enemy, foe, foeman, opposition
an armed adversary (especially a member of an opposing military force)
Luddite
any opponent of technological progress
withstander
an opponent who resists with force or resolution
besieger
an enemy who lays siege to your position
Type of:
individual, mortal, person, somebody, someone, soul
a human being

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