What is evil? Tough question!
I think I have to start with the notion of "intent:" that is, what is done to harm intentionally seems to me to qualify as evil. Lots and lots of natural events, accidents and so forth cause harm -- lots and lots of it, actually -- but in the absence of an intentional cause, I may describe these as tragedy, misfortune, calamity and so on. But I do not think I would call them evil.
On the other hand, harm done to another with full intent must always be considered evil in my view. It's why, for example, I despise capital punishment, or the missionary impetus to take the cultural and religious beliefs of others away from them, because they don't coincide with their own. That's evil.
@outlawState asked, "What about corporal or any chastisement of a child. The intention is to harm, but how could it be evil if done in good faith?" I say, if the intention is to harm, then whatever the faith, it is evil. If the intention is to correct behaviours that may eventually harm the child, then even in the best of faith they may be misguided, or ignorant, but not evil. And tragically, many children have been irreparably harmed, even killed, but such "good faith," but surely this is tragedy, not evil! (Though, since I really don't think ignorance is any excuse, I must still hold the parents culpable, but I do so with sadness and regret, rather than condemnation of evil.)
And if there is a "personal God," meaning quite explicitly one possessed of intention, and the result of that God's creation is needlessly harmful to what it has created, then I think that would be evil, too. A naturally caused volcano that kills people and decimates property is a calamity. A "destroyer" sent to intelligently pick out and kill all first born children is evil.