
1) Antagonist 2) Antichrist 3) Competitor 4) Dueler 5) Duelist 6) Dueller 7) Duellist 8) Enemy 9) Foe 10) Foeman 11) Luddite 12) Opponent 13) Opposer 14) Rival 15) Withstander
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https://www.crosswordclues.com/clue/adversary

1) Antagonist 2) Challenger 3) Cryptographic attack 4) Enemy 5) French word used in English 6) Human 7) Individual 8) Marvel Comic demon 9) Moriarty, to holmes 10) Mortal 11) Opponent 12) Opposer 13) Person 14) Resister 15) Rival 16) Somebody 17) Someone 18) Someone who offers opposition 19) Soul
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https://www.crosswordclues.com/clue/adversary

An adversary is generally considered to be a person, group, or force that opposes and/or attacks. Adversary may also refer to: ==Entertainment== ===Fiction=== ...
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http://en.wikipedia.org/wiki/Adversary
[cryptography] In cryptography, an adversary (rarely opponent, enemy) is a malicious entity whose aim is to prevent the users of the cryptosystem from achieving their goal (primarily privacy, integrity, and availability of data). An adversary`s efforts might take the form of attempting to discover secret data, corrupting some of the data in...
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http://en.wikipedia.org/wiki/Adversary_(cryptography)

• (a.) Opposed; opposite; adverse; antagonistic. • (n.) One who is turned against another or others with a design to oppose or resist them; a member of an opposing or hostile party; an opponent; an antagonist; an enemy; a foe. • (a.) Having an opposing party; not unopposed; as, an adversary suit.
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http://thinkexist.com/dictionary/meaning/adversary/

opponent; someone you are fighting or competing against
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http://www.encyclo.co.uk/visitor-contributions.php
Ad`ver·sa·ry noun ;
plural Adversaries [ Middle English
adversarie , direct from the Latin, and
adversaire , from Old French
adversier ,
aversier , from Latin
adversarius (a.) turned toward, (n.) an adversary. See
Adverse .] One who is turned...
Found on
http://www.encyclo.co.uk/webster/A/34
Ad'ver·sa·ry adjective 1. Opposed; opposite; adverse; antagonistic. [ Archaic]
Bp. King. 2. (Law) Having an opposing party; not unopposed; as, an
adversary suit.
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http://www.encyclo.co.uk/webster/A/35

[
n] - someone who offers opposition
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http://www.webdictionary.co.uk/definition.php?query=adversary

adversary One who, or that which, takes up a position of antagonism, or acts in a hostile manner; an opponent, antagonist; an enemy, a foe.
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http://www.wordinfo.info/words/index/info/view_unit/2285/
antagonist noun someone who offers opposition
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https://www.encyclo.co.uk/local/20974

An opponent. The defendant is the plaintiff's adversary.
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https://www.encyclo.co.uk/local/22316
[SAT terms] someone who offers opposition
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https://www.vocabulary.com/lists/28864
No exact match found.