Deviant behaviour or thinking is different from what people normally consider to be acceptable.
例句
...the social reactions to deviant and criminal behaviour...社會對偏常及犯罪行為的反應Of course, not all alcoholics and drug abusers produce deviant offspring.當然，并不是所有的酗酒者和吸毒者都會生育出不正常的后代。
N-COUNT
偏常者;反常者;離經叛道者
A deviant is someone whose behaviour or beliefs are different from what people normally consider to be acceptable.
英漢詞典釋義
adj.
不正常的,異常的
Deviant behaviour is one of the features of certain types of mental illness.反常舉動是某些精神疾病的特征之一。
英英詞典釋義
Noun
1. a person whose behavior deviates from what is acceptable especially in sexual behavior