活動|かつどうkatsudou[0]heiban (flat)
This browser can't play pronunciations (needs Safari 18.4 or later, or Chrome / Edge / Firefox).
- noun, suru verb, intransitive verbactivity (of a person, organization, animal, volcano, etc.); action; operation
- nounmoving picture
Conjugation
| Dictionary form | 活動する(かつどうする) |
|---|---|
| Polite (masu) | 活動します(かつどうします) |
| Negative (nai) | 活動しない(かつどうしない) |
| polite (masen) | 活動しません(かつどうしません) |
| classical zu / nu | 活動せず・活動せぬ(かつどうせず・かつどうせぬ) |
| Past (ta) | 活動した(かつどうした) |
| polite (mashita) | 活動しました(かつどうしました) |
| Past negative (nakatta) | 活動しなかった(かつどうしなかった) |
| polite (masen deshita) | 活動しませんでした(かつどうしませんでした) |
| Te form | 活動して(かつどうして) |
| Potential | 活動できる(かつどうできる) |
| Passive | 活動される(かつどうされる) |
| Causative | 活動させる(かつどうさせる) |
| Causative passive | 活動させられる(かつどうさせられる) |
| Conditional (ba) | 活動すれば(かつどうすれば) |
| tara | 活動したら(かつどうしたら) |
| Volitional | 活動しよう(かつどうしよう) |
| polite (mashou) | 活動しましょう(かつどうしましょう) |
| Imperative | 活動しろ(かつどうしろ) |
Common forms generated by rule; see the senses for honorific or irregular usage.
- Synonym営みいとなみWrittenWritten word for the everyday business of living, as in 「日々の営み」; it carries a sense of life and livelihood that 活動 does not.
- Synonym行動こうどうNeutralA concrete action taken toward a purpose, as in 「行動を起こす」; it stresses putting something into practice, where 活動 is activity in general.
- Synonym働きはたらきNeutralWork, or the way something functions, as in 「心臓の働き」; it highlights the role or effect of a thing rather than activity itself.
- Synonym営為えいいFormalA formal, academic-flavoured term for the activities by which people make a living; far stiffer and rarer than 活動.
- SynonymアクティビティCasualColloquial loanword for activities, especially hands-on experiences like 「アクティビティ体験」 or activity logs on an account.
- Related行為こういNeutralA deliberate act by a person, as in 「違法行為」; typically used when conduct is judged legally or morally, unlike the neutral 活動.
- Related作用さようWrittenWritten word for the action or effect one thing has on another, as in 「化学作用」; more formal than 活動 and centred on function.
- Related行いおこないNeutralA person's conduct or behaviour, as in 「日頃の行い」; it carries a moral slant, while 活動 is neutral about what is done.
- Antonym静止せいしWrittenWritten antonym of 活動: stillness, the state of remaining motionless instead of moving or operating.
- Antonym沈滞ちんたいWrittenWritten antonym of 活動: stagnation, a sluggish, lifeless state with no energy or progress.
Default to 「活動」 for activity in general. Use 「行動」 for concrete action taken, 「行為」 for deliberate acts judged morally or legally, 「働き」 and 「作用」 for how something functions, 「営み」 for daily living, 「行い」 for conduct, and 「静止」 for stillness.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only


