to believe wrongly; hold an erroneous belief.

What type of word is Misbeliever?

mis·be·lieve

Archaic To hold a false or erroneous belief or opinion, especially in religious matters. v.tr. 1. Archaic To believe falsely or erroneously in (a doctrine or opinion, for example).

What does it mean to be cut throat?

1 : killer, murderer. 2 : a cruel unprincipled person. cutthroat.