Translation

敵対的な / 対立的な / 争う姿勢の

Meaning

Adversarial means involving opposition, conflict, or a relationship where sides work against each other. It is common in law, politics, negotiations, and AI safety. The trap is confusing it with adverse, which means harmful.

Examples

• その会議はすぐに敵対的な雰囲気になりました。
  The meeting quickly became adversarial.
• 弁護士は敵対的な法制度に慣れていました。
  The lawyer was used to an adversarial legal system.