Denial

What does it mean to be in denial? Denial is defined as the action of declaring something untrue. People who have drug addictions are said to be in denial when they don't think they have a problem. Denial is the first sign of someone having a problem. People can be in denial without having an addiction or problem, there are people who deny that there's a God or that evolution is actually occurring. Denial can be applied to anything that can perceived as true or false.