adversary

對手、敵手正式

She finally beat her longtime adversary in the final round.

她終於在決賽中擊敗了長年的對手。

敵人、仇敵正式

The two countries were bitter adversaries for over thirty years.

這兩個國家有三十多年的時間互為死敵。

對抗式的、敵對的法律

Our courts rely on an adversary system to test the evidence.

我們的法院採用對抗制來檢驗證據。