Alien. I am not using these words that simplistically. One could use all of these words as arbitrarily as one could, but that will just muddy the water. I remember one guy was saying that he uses the word "Shiiit" to refer to all the so called "bad things" that happen in this world. And you say "bad". No problem. How do you deem something "bad"? What is the source?
I hope you understand the question. Is it something you feel innately? Is it something objective? Is it morality? Subjective or objective? Where does it come from?
OK, I'm happy to try to answer this. First though, I have to make it clear that I consider morality subjective, and I will answer for myself, not in some general definitive way. If all humans, or a large proportion of them, feel the same way, then there is a degree of generality, which could be said to approach an objective morality, but try as I might I cannot make an argument for an objective morality, comforting though that would be. I say that even if it were to be shown that there was an all powerful God who defines his own morality and commands us to follow it, it would still, in my view, be subjective to God.
My definition of "subjective" and "objective" is appropriate here. If something is objective, another person can experience it. X is objective if we can see it, touch it, and so on. "Subjective" things reside only in my mind. I can describe them to other people, but that's all. I know there are other definitions, but please read what follows in that light. If you believe morality to be objective, please answer - in a totally inanimate universe, would morality exist?
Given that, morality can only apply to sentient beings (trying to allow for other species and any possible beings that we might discover, like extra terrestrials and sentient computer programs). If a rock falls on another rock and breaks it, neither rock is capable of forming an opinion about its "goodness" or "badness". If the broken rock blocks a road, humans will, generally consider it to be "bad", but only in terms of how they are affected.
I'm going to continue using "bad" to describe what you are asking, and will drop the quotes from here on.
What is a bad thing to me? Obviously, something that causes me to feel some kind of discomfort. It might cause me pain, or frustrate my achieving something that I value, for example. If you ask where does the discomfort come from, it varies. A physical pain is obvious. Mental discomfort also applies, and is something I feel in a different way. Based on that, I form good/bad judgments on events that don't directly affect me. If you are hurt, I have something called empathy that allows me to understand how you feel and consider whatever caused that hurt to be bad (or not, obviously it gets complicated). I can feel that something that happens to inanimate objects is bad, but that tends to be because I have formed some subjective attachment to that object. For example if something that I consider beautiful is destroyed.
To answer "where does it come from"? Perhaps you can refine the question, as there are many directions in which that can go.
Have I answered what you asked?
I will also ask you to explain how this apples to the Problem of Evil.