perversion

1. N-VAR You can refer to a sexual desire or action that you consider to be abnormal and unacceptable as a perversion. 性变态[表不满]

The book was the authority on sexual perversions. 这本书是关于性变态的权威著作。

2. N-VAR A perversion of something is a form of it that is bad or wrong, or the changing of it into this form. 歪曲[表不满]

Critics say that the system is a dangerous perversion of democracy. 批评家们说，这种体系是对民主的危险的歪曲。