(stative) be sacred, prohibited, restricted, set apart, forbidden taboo - prohibited. restricted, forbidden, sacred All of these are in reference to people
I would say taboo is not necessarily something about a bad behavior (like cheating on someone) but a forbidden and/or unknown situations.
comes from the story as the two protagonists are members of the Church of Jesus Christ of the latter day saints, where homosexual relationships are forbidden
I guess "taboo" could refer to anything that is considered forbidden. It doesn't just have to be incest.
I understand taboo as something normally "forbidden".
