An adversary is generally considered to be a person, group, or force that opposes and/or attacks.
Adversary may also refer to:
- Satan ("adversary" in Hebrew), in Abrahamic religions
Entertainment
Fiction
- Adversary (comics), villain from the Marvel comics universe
- The mysterious antagonist who invaded the homelands in the comic book series Fables
Music
- Ad·ver·sary, Canadian industrial musician
Law
- Adversarial system, a system of law commonly used in common-law countries
- Adversary proceeding, proceeding used in bankruptcy processes
Science
- Adversarial collaboration, a scientific experiment
Computer science
- Adversary (cryptography), a malicious entity in cryptography whose aim is to prevent the users of the cryptosystem from achieving their goal
- Adversary model, in online algorithms, used to show competitiveness of randomized algorithms
- Adversarial alignment, when an adversarial users constructs inputs that bypass AI alignment
Other
- Adversarial purchasing, in business strategic management