The question is "What is Evil?" Not Hitler/Pol Pot/Darfur big, sweeping kind of evil -- I mean the little things that happen everyday to make life miserable.
From a Biblical point of view, we are all evil. None is good but God, all have fallen short. Ok, but other people lying and lusting and other things doesn't really bother me (personally) that much. I'm upset that people live in sin, and I desire for them to repent and be saved, but they aren't hurting me.
It's your family that can really hurt you. What they say has a way of getting around your defenses. It sticks in your mind, and makes you dwell on it. You want them to be caring and supportive.
Ok, but, ultimately, you can't rely on what other people think about you for your happiness.
But things can go a step further, I'm going to take a huge leap and propose a definition for evil:
Evil is making other people pay the price for your free choice.I think I've got something here. It's probably not perfect.
For example, a president declares war, the young men of the country will pay with their lives. Is the president evil?
I would say "no", as long as it is a "just" war. In that case, though, is the president really making a "free" choice? To some extent, he (or she) has a duty to engage in a just war. So, maybe the definition is ok.
And this has a Biblical implication. We are evil, because we make God pay the price for our sins. All the more so, if we continue in sin. And to expand on "What is love" (I think), love is to pay this price anyway (within reason).