"Fond illusion" is a phrase that refers to a belief or hope that is not based on reality. There are several synonyms that can be used in place of "fond illusion," including "delusion," "fantasy," "wishful thinking," "pipe dream," "fallacy," "misconception," or "idealist notion." Each of these words highlights the idea that someone may be holding onto a belief that is not grounded in truth. While it can be tempting to hold onto fond illusions, it is important to recognize when they are preventing growth or progress and let them go in order to move forward.