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delusional

C2
Fairly common

Pronunciation

UK

  • /dɪlˈuːʒənəl/

US

  • /dɪˈluʒənəl/

Meanings

Adjective

  1. holding obviously false or unrealistic beliefs despite evidence

  2. experiencing or characterized by delusions as a symptom of mental illness

Beyond the definition

Imagine someone building a magnificent castle out of sand, right on the beach, ignoring the incoming tide. That person might be described as delusional—holding on to beliefs that aren't based in reality. Being delusional isn't just about being mistaken; it's about firmly believing something despite clear evidence to the contrary.

The word often carries a tone of concern, suggesting someone is struggling with their sense of reality. You might say a character in a story is "delusional" if they believe they are secretly royalty, or that someone's hopes for winning the lottery after buying only one ticket are "a bit delusional." It's important to note that "delusional" can also be a clinical term used by mental health professionals to describe symptoms of certain conditions.

Examples

  1. 1

    Sleep deprivation

    After three days without sleep, he started saying strange, delusional things.

  2. 2

    Self-assessment

    She's delusional about how much work she can finish in one day.

    • Patterndelusional about + situation

      having unreal ideas about it

  3. 3

    Unrealistic plan

    If you think we can double sales by next week, you're delusional.

  4. 4

    Mental health

    His delusional belief that his phone was being watched worried his family.

More examples
  1. 5

    Figurative criticism

    The company kept going on little more than coffee and delusional optimism.

    • Phrasedelusional optimism

      hope that ignores reality

See also

Similar

Shades of meaning

Contrast

Do not confuse

Used with (collocations)

  • delusional thinking
  • delusional belief
  • delusional disorder
  • completely delusional

Word family

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Forms and spellings

1 form open this card.

Main spelling

  • delusionaladjective