delusional

Definition

Adjective describing someone or something characterized by, holding, or based on delusions; out of touch with reality in a significant way.

Example Usage

His delusional thinking prevented him from accepting that his business plan had major flaws.

Origin

Derived from 'delusion'; the adjectival form became standard in both clinical and colloquial usage.

Fun Fact

In informal speech, 'delusional' is sometimes used humorously for minor disconnects from reality ('I'm being delusional if I think I can run a marathon tomorrow'), diluting its clinical weight.

Source: Definition backfill (hailey)

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