scumbagishness
generally acting like a scumbag i.e. lying, cheating, neglecting to pay child support for years, getting your 8th DUI, etc.
We broke up due to his scumbagishness.
scumbagish
Something that someone does that is immoral, disgusting, and/or an action done by someone who is a scumbag.
That whore, she's such a scumbag, last night when she sucked 9 cocks simultaneously, that was really scumbagish of her.