Inemy
An in-law that is an enemy. Fake nice to your face, maliciously plotting your demise behind your back. They prefer email, text or Facebook sniping to direct confrontation. Accuse you of drama when you bust their lies or identify their personality disorder/s.
My inemy hijacked my birthday plans and told my spouse I was drama for being offended.
Inemies
A person who is very evil but refrains from ever doing something evil
All those people are inemies
I might hang out with them
I might hang out with them