Words / C1

di-LOOZHN/dɪˈluːʒn/

A delusion is a false belief you cling to despite evidence: under the delusion that, a dangerous delusion. Illusion is a false appearance (a trick of the light); hallucination is sensing something that is not there. Mistake is everyday and milder. Do not call a wrong date a delusion unless the person insists against proof.

Meaning

A false belief that you hold despite evidence, often a strong or lasting one.

Examples

• “It is a delusion to think the deadline will move itself.”
• “It is a delusion to think the inbox will empty itself overnight.”
• “An optical illusion is not a delusion; one fools the eye, the other the belief.”

Good to know

A false belief held despite evidence. Mix-up: illusion (false appearance). Sense without object: hallucination. Milder: mistake.

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