An incestuous relationship is one involving sexual intercourse between two members of the same family, for example a father and daughter, or a brother and sister.
例句
They accused her of an incestuous relationship with her father.他们指控她与父亲有乱伦关系。
ADJ-GRADED
狭隘排外的;小团体的
If you describe a group of people as incestuous, you disapprove of the fact that they are not interested in ideas or people from outside the group.
例句
Its inhabitants are a close and incestuous lot...该地居民紧密抱团，狭隘排外。Hospitals are very incestuous places.医院是非常狭隘排外的地方。