行動|こうどうkoudou[0]heiban (flat)

1. suru verb, intransitive verb, no-adjectiveaction; conduct; behaviour; behavior; mobilization; mobilisation
   彼かれは友人ゆうじんの行動こうどうに憤慨ふんがいした。↗

   He resented his friend's action.

• Synonym行いおこないNeutralDeeds or conduct viewed as a whole, often with a moral slant, as in 「日頃の行い」; 行動 stresses putting something into practice.
• Synonym振る舞いふるまいNeutralHow one carries and behaves in front of others, as in 「立ち居振る舞い」; also means treating someone to food or drink.
• Synonym行為こういWrittenWritten-style word for deliberate, willed acts, as in 「違法行為」; common in legal and moral judgement, where 行動 is more general.
• SynonymアクションCasualColloquial loanword for movement or action scenes, as in 「アクション映画」; also used for taking action.
• Synonym営みいとなみWrittenWritten word for one's daily round of living or work, as in 「日々の営み」; carries a sense of life itself.
• Synonym活動かつどうNeutralActivity, as in 「部活動」; suggests an ongoing series of actions rather than a single act.
• Related仕業しわざCasualColloquial word for something someone did, usually something bad, as in 「誰の仕業だ」; carries a tone of probing who is responsible.
• Related動きうごきNeutralMovement or trends, as in 「市場の動き」; centres on change and motion rather than deliberate action.
• Related態度たいどNeutralOne's attitude or stance toward a person or matter, as in 「仕事に対する態度」; not the action itself.
• Related行儀ぎょうぎNeutralManners and etiquette, as in 「行儀が悪い」; judges whether behaviour follows the rules.
• Related営為えいいFormalFormal, academic term for human activities of making a living; rare.
• Related素行そこうWrittenWritten word for one's everyday conduct, as in 「素行不良」; used mainly in evaluating character.
• Related挙止きょしWrittenWritten word for bearing and deportment, as in 「挙止端正」; has an old-fashioned, elegant flavour.
• Related品行ひんこうWrittenWritten word for moral conduct, as in 「品行方正」; judges behaviour on moral grounds.
• Antonym思考しこうNeutralThinking, as opposed to acting, as in 「思考と行動」; centres on the mind, not the deed.
• Antonym静止せいしWrittenWritten word for standing still; the opposite of 行動.

Use 「行動」 as the default word for action. For conduct judged morally pick 「行い」 or 「品行」, for bearing before others 「振る舞い」 or 「行儀」, for deliberate or legal acts 「行為」, for a bad deed by someone 「仕業」, for movement or trends 「動き」, and for thinking 「思考」.

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

1. あることを行おこなうこと。行為こうい。ふるまい。
2. 何なんらかの目的もくてきのために積極的せっきょくてきにことを行おこなうこと。
3. 一定いっていの行程こうていにもとづいて移動いどうすること。