having false or unrealistic beliefs or opinions: Senators who think they will get agreement on a comprehensive tax bill are delusional.
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.
- Sometimes de·lu·sion·ar·y .
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023