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逆効果

counterproductive effect, opposite effect

ɡʲ a̠ k ɯ̟ k o̞ː k a̠
逆 the opposite; the reverse + 効果 effect, effectiveness, efficacy
noun Rare #38,219
counterproductive effect, opposite effect Often used when an action produces the opposite of its intended result.
JA: 急に厳しくすると逆効果です。
EN: Being suddenly strict will be counterproductive.

そんなことをしたら逆効果になる。

Doing that would have the opposite effect.

彼の発言は逆効果になった。

His remarks backfired.

注意を払うと逆効果だぞ

If you pay attention, it'll have the opposite effect.

— ピエロがお前を嘲笑う (2014)

あの短気な性格を考えると―禁止命令は逆効果だったかもしれないわね

Considering his short temper, the restraining order may have had the opposite effect.

— フォーリング・ダウン (1993)

円高は日本の輸出産業に逆効果になっている。

The strong yen is having a negative impact on Japan’s export industries.