反応|はんのうhannou[0]heiban (flat)
This browser can't play pronunciations (needs Safari 18.4 or later, or Chrome / Edge / Firefox).
- noun, suru verb, intransitive verbreaction; response
- noun, suru verb, intransitive verbphysical reaction (to a stimulus); observable response (of an organism)
- noun, suru verb, intransitive verb, chemistryreaction; effect; change
Conjugation
| Dictionary form | 反応する(はんのうする) |
|---|---|
| Polite (masu) | 反応します(はんのうします) |
| Negative (nai) | 反応しない(はんのうしない) |
| polite (masen) | 反応しません(はんのうしません) |
| classical zu / nu | 反応せず・反応せぬ(はんのうせず・はんのうせぬ) |
| Past (ta) | 反応した(はんのうした) |
| polite (mashita) | 反応しました(はんのうしました) |
| Past negative (nakatta) | 反応しなかった(はんのうしなかった) |
| polite (masen deshita) | 反応しませんでした(はんのうしませんでした) |
| Te form | 反応して(はんのうして) |
| Potential | 反応できる(はんのうできる) |
| Passive | 反応される(はんのうされる) |
| Causative | 反応させる(はんのうさせる) |
| Causative passive | 反応させられる(はんのうさせられる) |
| Conditional (ba) | 反応すれば(はんのうすれば) |
| tara | 反応したら(はんのうしたら) |
| Volitional | 反応しよう(はんのうしよう) |
| polite (mashou) | 反応しましょう(はんのうしましょう) |
| Imperative | 反応しろ(はんのうしろ) |
Common forms generated by rule; see the senses for honorific or irregular usage.
- SynonymリアクションNeutralLoanword for reactions that show in the face or movements, common in daily conversation and variety shows; 「反応」 is broader and also covers chemical reactions.
- SynonymレスポンスNeutralLoanword for the response speed of systems and equipment, and for replies; 「反応」 is the broader word.
- Related反響はんきょうNeutralFor the response something draws from the public or society, as in 「大きな反響を呼ぶ」; 「反応」 is not limited to this social sense.
- Related応答おうとうNeutralAnswering or replying to a question or call, as in 「質疑応答」; 「反応」 centers on the reaction that follows a stimulus.
- Related応ずるおうずるWrittenWritten, formal word for responding to or meeting a request; 「反応」 is the reaction produced by a stimulus.
- Related応じるおうじるNeutralResponding to a request or adjusting to circumstances, as in 「注文に応じる」, stressing acceptance and cooperation; 「反応」 is a response to a stimulus or event.
- Related応えるこたえるNeutralMeeting expectations or demands, and also affecting the body; 「反応」 is the reaction that follows a stimulus.
- Antonym沈黙ちんもくNeutralOpposite of 「反応」 in whether a response is given: staying silent and saying nothing.
- Antonym無反応むはんのうNeutralOpposite of 「反応」 in whether a response is given: showing no reaction at all.
Use 「反応」 for reactions to a stimulus, including chemical reactions. For public response choose 「反響」, for questions and answers 「応答」, for reactions showing in the face or body 「リアクション」, and for system or device responses 「レスポンス」. The antonym is 「無反応」.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only


