A college basketball villain has one of two qualities.
1. A significant portion of the college basketball viewing public roots for that person or group to fail.
2. That person or group does or represents something that creates considerable ill will toward that person or group.
Often, but not always, both qualities are present. In most cases, the villain is highly successful, and the success often is the root of outsiders' contempt.
Villainy can be created by accomplishments, behavior or attitude. Or it can be created in retrospect, becoming a symbol of something distasteful.
One person's villain is often another person's hero. A person perceived as a basketball villain is, in many cases, a nice person.
Obviously our list of the 20 biggest villains is a subjective list, and we may omit someone who should be included.