adversarial

/ad-ver-SAIR-ee-ul/adjective

involving conflict or opposition

Cross-examination is adversarial by design.
Synonyms
antagonistic, hostile, oppositional
Antonyms
cooperative, amicable
Root
vers- (turn)
Memory hook
ad + vers (turned): turned against each other.

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adversarial — meaning, examples & GRE vocabulary | WordNerd