Evil may be a bad word depending on your Pagan or Polytheistic tradition. Many people in the modern Pagan community don't like using it because they don't believe in absolutes or an inherent value, believing that good and bad, positive and negative, are both possible from anyone or anything, while some Reconstructionist religions like mine talk about evil many times in their myths and morals. You don't have to look far at all to find the word in Hellenism. Delphic Maxim 31 explicitly and simply says, "Shun Evil." But many Pagans, I would imagine, do not think that things are as simple as good and evil.
In many ways, they are correct. Absolute evil means that nothing good can come from it, but any being with free will can choose to do good, and if they can make that choice, then they are not absolutely evil, because they have the capacity for the opposite. However, I can certainly say from experience that there are people and things that prefer to act on their hostile and evil sides, at least toward certain people anyway, and that person may unfortunately end up being yourself.
I think that we are quick to reject the word evil out of existence simply because we don't actually understand what it means. We're so used to being conditioned by the mainstream to think that evil is a Christian concept of ultimate inherent character, but it's not. Evil is simply the opposite of good, or the absence of good. So therefore, we have to ask, is it possible that someone or something can do the opposite of good, or that a thing cannot possess any good qualities? Most certainly. Someone or something who tries to murder you or destroy your family, isn't good or creating any good. It may cause you to do something that results in good for yourself, but they and their act themselves are not good in any capacity. Or perhaps a more common example, if you have a severe mental disorder, like depression, that drives you to want to commit suicide, it is also something that carries no good, and in fact, is in direct opposition to what a "good" brain or mind would be.
In my view, the only Ultimate Good in the Universe, that has no capability or desire of evil, is the Gods and the Higher Powers, like the Spirits and Heroes. Because the Gods were made from all that is good in the first place, and because they are the most powerful of all things and are never able to be conquered, evil can never consume or impact them in any form. In fact, the Gods exist explicitly in opposition of evil, chaos and disorder. This is why evil or negativity runs away when the Gods and Heroes are invoked successfully. It becomes vanquished immediately.
In the Goodness of the Gods,