The word "badness" has several meanings, depending on its context.
1) In a general sense, it can refer to something that is not good or desirable, such as bad weather, bad food, or bad behavior.
2) It can also be used to describe someone who is immoral or wicked, for example "He's a real badness."
3) Finally, in some dialects of English, the word "badness" can refer to an excessive amount of something, such as too much spice or flavor.