こうい行為koui
1.

A deliberate action taken by an individual that is motivated by a specific intention or goal, often resulting in a tangible outcome.

2.

A conscious behavior executed with free will, subject to moral evaluation, and typically involving a physical manifestation of that choice.

3.

An individual's voluntary engagement in an activity that generates legal consequences, distinguishing between mere behavior and purposeful actions.

Example:

彼は自分の行為を正当化しようとしている。

じさつこうい自殺行為jisatsukoui
1.

An action that deliberately endangers one's own life, often perceived by others as certain to lead to failure or harm, reflecting a profound state of despair or hopelessness.

2.

An intentional behavior that undermines one's own well-being, characterized by a clear understanding of the risks involved, often driven by overwhelming emotional distress or existential crisis.

3.

A reckless choice that signifies a disregard for personal safety, typically interpreted as an expression of deep inner turmoil or a cry for help, rather than a literal attempt to end life.

スパイsupaiこうい行為koui
1.

秘密の情報を収集するために、他国や団体に対して行う隠密な活動。

2.

特定の目的のために、密かに敵または競争相手の動向や情報を探る行為。

3.

国家間の対立や競争において、敵対的手段として用いられる情報収集の過程。

しょうこうい商行為shoukoui
1.

An activity involving the buying and selling or exchanging of goods with the intent of making a profit.

2.

Actions that pertain to commercial activities, which can include various types of transactions defined under commercial law, distinguishing between acts considered inherently commercial, those performed as part of a business operation, and those carried out by merchants in their commercial capacities.

3.

The conduct of business operations that involve the exchange of commodities or services primarily aimed at generating financial gain.

せいこうい性行為seikoui
1.

A general term for acts between individuals, typically involving sexual desire, with a specific emphasis often placed on the act of intercourse itself.

2.

The actions taken to fulfill sexual urges or desires, primarily understood to refer to sexual intercourse.

Example:

梅毒は性行為を通じて感染する病気です。