adjective
1. Not performing normally, as an organ or structure of the body; malfunctioning.
2. Having a malfunctioning part or element.
3. Behaving or acting outside social norms.
SOURCE: Dictionary.com
EX. I think it would be very difficult to find a family unit more dysfunctional in Westeros than the Lannisters-- considering the fact that the family "dog" is a horribly scarred bodyguard who cuts men down with ease (I think he's hiding some where in the background...).