What is "incesttuously"

Incesttuous \In*cest"tu*ous\ (?; 135), a. [L. incestuosus: cf. F. incestueux.]

1. Guilty of incest; involving, or pertaining to, incest; as, an incestuous person or connection.
   --Shak.

   Ere you reach to this incestuous love, You must divine and human rights remove.
   --Dryden.

2. resembling incest; between people or groups so closely related as to make such activity improper or unethical; as, an incestuous coziness between the management of the company and its union; an incestuous relationship between the salesman and the purchasing manager. [PJC] -- In*cest"tu*ous*ly, adv. -- In*cest"tu*ous*ness, n.