性行|せいこうseikou[0]heiban (flat)

1. nouncharacter and conduct

• Related性質せいしつNeutralCovers the nature or qualities of people and things generally, so it has much wider use; 「性行」 is limited to a person's character and conduct.
• Related気質きしつNeutralRefers to temperament or temper, and also to the ethos of a type of person, as in 「職人気質」 (read かたぎ); it is about disposition alone and does not cover conduct.

Use 「性行」 for a person's character and conduct; it appears mostly in evaluative comments and official documents, as in 「性行不良」. For the nature of people or things say 「性質」, and for temperament say 「気質」.

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

1. 人ひとの性質せいしつと行為こうい。