• 敵意てきい — hostility
• 宿敵しゅくてき — archenemy / rival
• 敵国てきこく — enemy nation
• 政敵せいてき — political opponent
• 敵かたき — foe / enemy (literary)

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敵 is a phono-semantic compound: 舌 (tongue, providing sound) plus 攵 (strike, representing action). It symbolizes confrontation or conflict — someone opposed to you, whether in war, politics, or competition.

彼かれは 昔むかしの敵てきだったが、今いまでは 親友しんゆうだ。
He used to be an enemy, but now he is a close friend.

敵かたきを 討うつために 旅たびに 出でた。
He set out on a journey to avenge his enemy.