Adjective
relating to or involving incest
resembling incest as by excessive intimacy
Source: WordNetBelief and delusion are incestuous siblings. Aleksandar Hemon
Britain is blessed with a functioning political culture. It is dominated by people who live in London and who have often known each other since prep school. This makes it gossipy and often incestuous. David Brooks
Ideas are incestuous. Howard Raiffa
London is a small place, and it is very incestuous. People know where you live. Everybody is sort of on top of each other. Jeanette Winterson
There is but one way for a president to deal with Congress, and that is continuously, incessantly, and without interruption. If it is really going to work, the relationship has got to be almost incestuous. Lyndon B. Johnson
The incestuous relationship between government and big business thrives in the dark. Jack Anderson