Wrongdoing always suggests a negative action, reflecting badly on someone's character or integrity. His career was ruined by allegations of wrongdoing.
Pro Tip 2/3
Broad Application
Can be used for a wide range of bad actions, from minor infractions to major crimes. He was fired for a minor act of wrongdoing at work.
Pro Tip 3/3
Severity Variation
The severity of wrongdoing can vary greatly, sometimes requiring context to understand its gravity. She felt guilty for her wrongdoing, although it was just a small lie.