counterargument

詳細解釋：

coun.ter.ar.gu.ment

n.（名詞）
An argument in opposition to another.
反論據：相反的回答或論據
Something that undermines an argument or deters someone from action:
反作用：使某論點變弱或使某人不採取行動的東西：
例句：
The students considered demonstrating for free elections, but their country`s secret police provided a powerful counterargument.
學生們考慮過為自由競選而示威，但國家的秘密警察使他們不得不打消這個念頭