名詞 antagonist:

1. someone who offers opposition
   同義詞：adversary, opponent, opposer, resister
2. a muscle that relaxes while another contracts
3. a drug that neutralizes or counteracts the effects of another drug

1. I am bound to furnish my antagonists with arguments, but not with comprehension.
   我一定要向?qū)κ痔峁幷擖c(diǎn)，但并無予以理解的必要。
2. He ripped into his antagonist with fury.
   他向他的對手猛撲過去。
3. A sparrow fluttering about the church is an antagonist which the most profound theologian in Europe is wholly unable to overcome.
   在教堂附近飛來飛去的麻雀，是為歐洲學(xué)識最深的神學(xué)家們完全無法克服的敵手。

an.tag.o.nist

n.（名詞）
One who opposes and contends against another; an adversary.See Synonyms at opponent
對抗者，對手，敵手：反對另一人及與另一人競爭的人；對手參見 opponent
The principal character in opposition to the protagonist or hero of a narrative or drama.
反面主角：敘事文學(xué)或戲劇中與主人公或英雄相對立的主要人物
Physiology A muscle that counteracts the action of another muscle, the agonist.
【生理學(xué)】 拮抗肌，對抗?。旱窒∪庾饔玫牧硪粔K肌肉，收縮肌
Biochemistry A chemical substance that interferes with the physiological action of another, especially by combining with and blocking its nerve receptor.
【生物化學(xué)】 拮抗藥，對抗藥：通過與另一種化學(xué)物質(zhì)的結(jié)合或阻礙其神經(jīng)接受體而干擾其生理作用的一種化學(xué)物質(zhì)

【引伸】
antag.onis.tic
adj.（形容詞）
antag.onis.tically
adv.（副詞）