wickedness: wrongdoing that sets itself against what is right, and the guilt it brings
This is the abstract word for being in the wrong. It names the evil a person does, not the person who does it, and the Hebrew Bible almost always sets it directly opposite צֶדֶק, the word for righteousness. To speak of this wickedness is to say that a life, an act, or a ruling has landed on the wrong side of a clear moral and legal line.
The word runs across a small range that all shares that core. Most often it is moral and religious evil in general: conduct God hates, the food and rule and plans of people who do wrong. In courtroom and covenant settings it narrows to guilt, the actual wrong a person is charged with and must turn from or confess. And in a few sharp passages it comes all the way down to earth as dishonest gain, the fraud of rigged scales and short measures.
These are shades of one idea rather than separate words. Whether the setting is a psalm about God's character, a prophet's warning to turn back, or a complaint about a crooked merchant, the term marks the same thing: the wrong that stands against the right, and the liability that wrong creates.