How about this: Virtually all of us in the world are conscious (between sleeps), and we prefer to keep on living and being conscious with some enjoyment, and without too much distress, as long as we can. Call that kind of consciousness, and its prospects, "good life" for short. We know we want it for ourselves and certain people around us, and we know everyone else does, too, in their own lives.
People's "good life" can be harmed by increasing their distress, or by shortening their lives, which can add distress to still other people's lives.
We could say that "good" is human activity that tends to increase the sum total of "good life" for everyone. "Evil" would be any human activity that reduces the sum total of "good life" for everyone, by deliberately and knowingly disregarding or harming "good life" for other people who haven't themselves deliberately harmed anyone else's "good life".
OK, that's my philosophy for today. I'm sure it's not perfect, but I have the idea that the whole question seems tied up with consciousness and its desirability somehow.