奇行

1. Origins, structure, and basic meaning

• Structure: 奇行 (きこう) is a noun for conduct that appears bizarre or outside ordinary expectations.
• Basic usage: 人物が見せる奇行 concerns a fictional character’s behavior with a hidden reason, while 突然の奇行に驚く describes others reacting to unexpected conduct.

2. Common pitfalls and similar expressions

• Judged behavior and underlying reason
  • 奇行 contains an observer’s judgment of behavior, and there may be a 隠れた理由. It is not a diagnosis of the person’s health or character.