B1 noun Neutral

行動

/koːdoː/

The way in which one acts or conducts oneself, especially toward others; behavior or action.

Examples

3 of 5
1

彼の不思議な行動にみんなが驚いた。

Everyone was surprised by his strange behavior.

2

緊急時には、落ち着いて行動してください。

In case of emergency, please act calmly.

3

もっと早く行動すればよかったのに。

You should have taken action sooner.

Word Family

Noun
行動
Verb
行動する
Adjective
行動的
💡

Memory Tip

Kou (go) + Dou (move). Moving and going - taking action!

Quick Quiz

言葉よりも____で示す方が説得力がある。

Correct!

The correct answer is: 行動

Examples

1

彼の不思議な行動にみんなが驚いた。

everyday

Everyone was surprised by his strange behavior.

2

緊急時には、落ち着いて行動してください。

formal

In case of emergency, please act calmly.

3

もっと早く行動すればよかったのに。

informal

You should have taken action sooner.

4

動物の集団行動に関する研究を行う。

academic

Conduct research on the collective behavior of animals.

5

消費者の行動パターンを分析して、広告を出す。

business

Analyze consumer behavior patterns to place advertisements.

Word Family

Noun
行動
Verb
行動する
Adjective
行動的

Common Collocations

行動を起こす to take action
集団行動 collective behavior
行動範囲 range of activity
問題行動 problematic behavior
単独行動 acting alone

Common Phrases

自由に行動する

to act freely

行動を共にする

to act together

行動に移す

to put into action

Often Confused With

行動 vs 行為

Koudou refers to general behavior or movement; Koui refers to a specific, often moral or legal, act.

📝

Usage Notes

Used in TOEFL Biology (animal behavior) and Psychology (human behavior) passages.

⚠️

Common Mistakes

Do not confuse with 'katsudou' (activity). Koudou is more about the 'act' or 'behavior'.

💡

Memory Tip

Kou (go) + Dou (move). Moving and going - taking action!

📖

Word Origin

Kou (to go/walk) + Dou (to move).

Grammar Patterns

〜を行動に移す 〜が行動する

Quick Quiz

言葉よりも____で示す方が説得力がある。

Correct!

The correct answer is: 行動

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