Word Entry- Hamlet Act 1 Scene 5

1. "Ay, that incestuous, that adulterate beast,With witchcraft of his wit, with traitorous gifts—" (Line 42)
2.  My guess is that the word, incestuous, means incest. It would make sense because the dead king is telling Hamlet that the killer is now wearing the crown.
3.  Incestuous: involving incest (Dictionary.com)
4. My guess was correct. The dead kind is disgusted with his brother marriage to his wife after the murder.