opponent, competitor, enemy, foe, rival

名詞 enemy:

1. an opposing military force
2. an armed adversary (especially a member of an opposing military force)
   同義詞：foe, foeman, opposition
3. any hostile group of people
4. a personal enemy
   同義詞：foe

1. After several reverses the enemy was forced to retreat.
   幾經失敗之后，敵軍被迫后撤。
2. The ship was sunk by an enemy torpedo.
   這艘船被敵人的魚雷擊沉了。
3. In a frenzy of hate he killed his enemy.
   在一陣痛恨的狂亂中，他殺死了敵人。
4. The shield protected him from the blows of his enemy.
   這盾牌保護他免受敵人的打擊。
5. The city is held by the enemy.
   這座城市已被敵人占領。
6. This defeat was a powerful blow to the enemy.
   這次失敗是對敵人的有力的打擊。
7. The enemy was forced to retreat.
   敵人被迫撤退。

en.e.my

n.（名詞）
【復數】 en.e.mies
One who feels hatred toward, intends injury to, or opposes the interests of another; a foe.
仇人，仇敵：一個讓人憎恨，意圖傷害或反對他人興趣的人；敵人

A hostile power or force, such as a nation.
敵方：敵對勢力或軍隊，例如一個民族
A member or unit of such a force.
敵人，敵兵：象這樣的勢力中的一個成員或單元
A group of foes or hostile forces.See Usage Note at collective noun
一群敵人，敵對勢力參見 collective noun
Something destructive or injurious in its effects:
有害物，加害物：危害或傷害人的事物：
例句：
.Art hath an enemy called Ignorance.(Ben Jonson)
.藝術有個敵人叫做無知.(本·瓊森)

adj.（形容詞）
Of, relating to, or being a hostile power or force.
敵人的，敵軍的：屬于或與敵軍或敵對力量相關的

來源：
Middle English enemi
中古英語 enemi
from Old French
源自 古法語
from Latin inimocus
源自 拉丁語 inimocus
in- [not] * see in-
in- [不] *參見 in-
amocus [friend]
amocus [朋友]

<參考詞匯><同義詞>enemy,foe,opponentThe central meaning shared by these nouns is .one who is hostile to or opposes the purposes or interests of another.:
這些詞所共同的中心意思是.對他人充滿敵意或與他人目的、興趣相對立的人.：
例句：
was betrayed by his enemies;
被他的敵人陷害；

例句：
a foe of fascism;
法西斯主義的敵人；

例句：
a political opponent.
政治對手