strong opposition; vehement objection
Used when someone is firmly against a plan, idea, or action. Often appears with verbs like する, だ, or in phrases like 大反対を受ける.
その計画には大反対です。
I am strongly opposed to that plan.
住民たちは工場建設に大反対した。
The residents vehemently opposed the construction of the factory.
大反対 and 猛反対 both describe intense opposition, but 猛反対 more strongly evokes aggressive, emotional resistance while 大反対 just emphasizes scale.
Compound of 大 (big, great) and 反対 (opposition).