delusional

Sometimes de·lusion·ary

[dih-loo-zhuh-nl]

adjective

1. having false or unrealistic beliefs or opinions.

   Senators who think they will get agreement on a comprehensive tax bill are delusional.

2. Psychiatry.,  maintaining fixed false beliefs even when confronted with facts, usually as a result of mental illness.

   He was so delusional and paranoid that he thought everybody was conspiring against him.

Word History and Origins

Origin of delusional¹

First recorded in 1850–60; delusion ( def. ) + -al ¹ ( def. )

Related Words

• unrealistic