You are correct, I have no definition of evil, but not because my worldview cannot account for it, but because I learned what evil was the same way every other person, including you, learned what it was,... we experience it, or see it, and then find out that there is already a term for it.
You are quite mistaken if you think you've experienced life like others.
Because in order to have a logical and rational (your tools you use to determine things) view of this universe, you must determine root meaning, root causes.Why are you so obsessed with me reinventing the wheel by providing some definition I would make up for evil? Evil has been defined accurately already and that's how I use it. Why is that so difficult for you to get? (psssssst... hey.... wink, wink, nudge, nudge, I know it's not difficult for you and you are acting obtuse to avoid the point... I won't tell - because everybody can already tell)
Amorality is the only thing you can determine in a godless chance universe. Therefore with the root cause of chance and amorality, there is no room for "evil." There is no actual right or wrong, just random choices.
And so, I wait for you to catch up, to quit trying to persuade me you are just as moral as the next guy, that you have any basis to extract "evil" from a chance universe. That is the theist sandbox.