aberration
🇺🇸
/ˌæbəˈreɪʃn/
🇬🇧
/ˌæbəˈreɪʃn/
An unusual or unexpected event or behavior that deviates from what is normal or expected.
The teacher was surprised by the student's aberration, as he was usually well-behaved.
先生は生徒の逸脱に驚いた、彼は通常よく振る舞っていたからです。