1The patient suffered from a delusion that he was being followed by the government.
2Is it a delusion to think that we can solve climate change in the next decade?
3Her delusion that she was a princess led her to make some very poor financial decisions.
4The doctor tried to help the patient overcome his delusion by using a combination of therapy and medication.
5The conspiracy theory spread quickly, but most experts considered it a delusion with no basis in reality.