反動|はんどうhandou[0]heiban (flat)

1. nounreaction; recoil; kick; backlash

• Synonym反発はんぱつNeutralCovers pushback against someone's words or actions, or a rebound like a stock-price rally; 「反動」 leans toward opposite-direction motion after an action.
• Related反作用はんさようWrittenWritten/formal prose: a physics term for the reaction force one body exerts back on another; 「反動」 also covers a conservative trend running against the tide in society.
• Antonym前進ぜんしんNeutralMoving forward or making progress toward a goal — the opposite of 「反動」, which moves against the current.

Pick 「反動」 for recoil after an action or a trend countering the current, as in 「反動勢力」 and 「その反動で」. Use 「反作用」 for the physical reaction force and 「反発」 for pushback against someone or a stock-price rebound; the opposite is 「前進」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 力ちからや作用さようが働はたらくときに反作用はんさようで反対はんたい方向ほうこうに進すすむこと。
2. ある傾向けいこうに対抗たいこうし生しょうじる反対はんたいの傾向けいこう、動うごき。
3. 歴史れきしの流ながれや改革かいかく、変化へんか、革新かくしん、進歩しんぽに反対はんたいして旧来きゅうらいのものに戻もどしたり維持いじしようとする傾向けいこう。その人ひと。