what is the general definition/idea of an evil person?

we all have a different perspective of what makes an evil person, so my idea of an evil bastard is that they take pleasure in the suffering of others, they're a narcissistic douche, and they want to see others fail. I hate those type of people with mottos like: "IT'S NOT ENOUGH THAT I SUCCEED, OTHERS MUST FAIL"

which brings me to my next question, does it make us evil to want to see evil people fail in trying to bring us down? does it make us evil to enjoy seeing them suffer as we live happily with our lives while karma bites them in ass and delivers it's own justice? if it does, maybe i'm evil myself, which makes this statement all ironically hypocritical?