他们酩酊大醉，行为异常，大喊大骂。

They get trashed and act totally out of character, shouting and swearing.

《柯林斯英汉双解大词典》

这只熊的行为异常，可能是因为饥饿吧。

The bear behaved abnormally, probably because of hunger.

youdao

去年该生曾因行为异常被送入医院接受治疗。

The student had been hospitalized once last year for abnormal behavior.

youdao

He noticed that the pigeons started behaving in strange ways and he kept them separate so they couldn't learn from each other.

他发现鸽子行为异常,举止乖张,他把鸽子分开拘禁,使它们不能沟通

耶鲁公开课 - 金融市场课程节选

because there actually is no proof of any social deviance or destruction of people with it.

因为没有证据真正表明同性恋者有任何社会异常行为和破坏力。

给我结婚的自由 - SpeakingMax英语口语达人

Error is not a deviance from truth. Right?

错误并不是真理的一种异常行为，对吧？

耶鲁公开课 - 文学理论导论课程节选