adversarial

adjective

ad·​ver·​sar·​i·​al ˌad-vər-ˈser-ē-əl 

ˌad-və-, 

-ˈse-rē-

: involving two people or two sides who oppose each other : of, relating to, or characteristic of an adversary or adversary procedures (see adversary entry 2 sense 2)

an adversarial relationship

an adversarial system of justice with prosecution and defense opposing each other

Synonyms of adversarial

• hostile
• negative

Examples of adversarial in a Sentence

an adversarial system of justice with prosecution and defense opposing each other

the relationship between the president and the congress should not be adversarial if anything is to get done

Recent Examples on the Web

Conversations become collaborative rather than adversarial. —Allen Buchanan, Oc Register, 23 May 2026

From a buyer’s perspective, this is not adversarial. —David Chapman, Forbes.com, 22 May 2026

Colbert’s final show mostly stayed away from politics, with even the opening monologue tending toward less pointed jokes about whimsical subjects like potholes on an airport runway, as if the host was intent on not going out on an adversarial note. —Chris Willman, Variety, 22 May 2026

Now the two adversarial power-brokers are the unseen Raven and Iliya (Stoycho Kostadinov, seemingly a bodybuilder in real life). —Sophie Monks Kaufman, IndieWire, 22 May 2026

Word History

Etymology

adversary entry 1 + -al entry 1

First Known Use

1839, in the meaning defined above

Rhymes for adversarial

• biserial
• filarial
• malarial
• subaerial
• actuarial
• secretarial
• urticarial
• aerial
• areal
• ariel
• burial
• antimalarial

Kids Definition

adversarial

adjective

ad·​ver·​sar·​i·​al ˌad-vər-ˈser-ē-əl 

: involving two people or two sides who oppose each other

Legal Definition

adversarial

adjective

ad·​ver·​sar·​i·​al ˌad-vər-ˈser-ē-əl 

: of, relating to, or characteristic of an adversary or adversary procedures : adversary