adversary
Americannoun
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adversaries
plural
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a person, group, or force that opposes or attacks; opponent; enemy; foe.
- Antonyms:
- ally
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a person, group, etc., that is an opponent in a contest; contestant.
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the Adversary, the devil; Satan.
adjective
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of or relating to an adversary.
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involving adversaries, as plaintiff and defendant in a legal proceeding.
an adversary trial.
noun
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a person or group that is hostile to someone; enemy
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an opposing contestant in a game or sport
adjective
Synonym Usage
Adversary, antagonist mean a person or a group contending against another. Adversary suggests an enemy who fights determinedly, continuously, and relentlessly: a formidable adversary. Antagonist suggests one who, in hostile spirit, opposes another, often in a particular contest or struggle: a duel with an antagonist.
Other Word Forms
Derived Forms
Inflected Forms
Nouns
Etymology
Origin of adversary
First recorded in 1300–50; Middle English adversarie, from Latin adversārius; equivalent to adverse + -ary; replacing Middle English adversere, from Anglo-French
Explanation
An adversary is an enemy or someone who opposes someone else. In tennis, you stand across the net from your adversary. Adversary is related to the word adverse, meaning "against or contrary" — so think of an adversary as someone whom you are fighting against. If you're the undefeated chess champion, you have bested every single one of your adversaries. Adversary is derived from a Latin word meaning "against."
Vocabulary lists containing adversary
100 Words Every Middle Schooler Should Know
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Essential Academic Vocabulary for Middle School Students, List 1
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"Give Me Liberty or Give Me Death" by Patrick Henry (1775)
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
Hybrid warfare or hybrid attacks are loose terms which tend to describe non-military methods, for example cyberattacks, sabotage or misinformation, designed to exert pressure and destabilise an adversary.
From BBC ● Sep. 23, 2026
The pilot said that he and another aircraft were providing adversary and tactical training for U.S. military aircrews, according to the report.
From Los Angeles Times ● Sep. 23, 2026
We are increasing readiness against existing threats, and the United States has on-orbit space control weapons capable of defending the Joint Force against hostile adversary action.
From Slate ● Sep. 17, 2026
"The US has on-orbit space control weapons capable of defending the Joint Force against hostile adversary action," a US Space Force spokesperson said in a statement that did not provide specifics on the weapons.
From Barron's ● Sep. 15, 2026
Ike defended the U-2 flights as necessary when dealing with a secretive and unpredictable adversary.
From "Fallout: Spies, Superbombs, and the Ultimate Cold War Showdown" by Steve Sheinkin
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By forcing adversaries to burn through expensive interceptors, the incoming swarms can exhaust allied air defenses.
From The Wall Street Journal ● Sep. 27, 2026
Speaking at the UK Space Conference, Streeting said that threat from Britain's adversaries was growing in "scale, speed and sophistication", adding that the "challenges in space increasingly mirror the geopolitics on Earth".
From BBC ● Sep. 23, 2026
The RAF has been using a ground-based system for the past year, which a defence source said had already been used "to deter our adversaries".
From BBC ● Sep. 23, 2026
The purpose is for nations to debate and for adversaries to converse.
From The Wall Street Journal ● Sep. 21, 2026
After returning to the United States, he served as a city councillor in Washington, D.C., where his uncompromising positions made him many friends and numerous adversaries.
From "The Best of Enemies" by Osha Gray Davidson
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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.