/ɪnˈsestʃuəs/
in·ces·tu·ous
BrE /ɪnˈsestjuəs/
NAmE /ɪnˈsestʃuəs/
involving sex between two people in a family who are very closely related
an incestuous relationship
(disapproving)
involving a group of people who have a close relationship and do not want to include anyone outside the group
The music industry is an incestuous business.
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in·ces·tu·ous·ly
BrE /ɪnˈsestjuəsli/
NAmE /ɪnˈsestʃuəsli/