Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
delusion
Grammar usage guide and real-world examplesUSAGE SUMMARY
The word 'delusion' is correct and usable in written English.
You can use it to describe a false belief held by someone, usually because of a mental illness. For example, "His delusion that he was the king of the kingdom led to his eventual downfall."
✓ Grammatically correct
News & Media
Opinion
Books
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
55 human-written examples
He scored against Germany in an 8-3 whichwhich proved a snare and a delusion.
News & Media
"That the sun moves round the Earth was once a delusion, and is still an illusion" (Fowler) DeMille, Cecil B (1881-1959) Hollywood producer and director; the B stood for Blount Democrat, Democratic In American politics, Democrat is a noun, Democratic an adjective: Hillary Clinton is a Democrat, and a member of the Democratic party.
News & Media
You know, the guy who reckons climate change is a "scientific delusion"… hang on, who is that behind your modest-sized bookcase?
News & Media
It will be destroyed by the inevitable disappointments of life, which overwhelm the delusion every generation has that theirs is special.
News & Media
Mention marriage, and this party vanishes away to the wilder shores of delusion.
News & Media
He said it was a "delusion" to think that changing the way the BBC was run would solve its problems.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
5 human-written examples
Tony McNulty, a Home Office minister, dismissed Davis's campaign as a "complete circus, tinged with vanity with a bit of self-delusion" and hinted that the true motive lay in shadow cabinet divisions which had yet to be unearthed.
News & Media
Confirmation of her self-delusion came soon enough.
News & Media
Every bit of family fun in that book is portrayed as self-delusion even before the tragedy.
News & Media
In science, though, self-delusion is still in charge.
News & Media
It is a measure of the enduring impact of the miners' sacrifice and the potential power of radical trade unionism that, a generation after the event, it is still felt necessary to paint the strike as a dismal morality tale and its leadership as the epitome of vain self-delusion.
News & Media
Expert writing Tips
Best practice
Use "delusion" when describing a fixed, false belief that is not amenable to change in light of conflicting evidence. Be mindful of its clinical connotations, particularly when discussing mental health.
Common error
Avoid using "delusion" interchangeably with "illusion". "Delusion" refers to a false belief, while "illusion" refers to a misinterpretation of sensory input. For instance, mistaking a rope for a snake is an illusion, while believing you are a historical figure is a delusion.
Source & Trust
90%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The word "delusion" functions primarily as a noun, referring to a false belief or idea. Ludwig AI confirms this, presenting numerous examples where "delusion" serves as the subject or object of a sentence, describing the state of being deluded.
Frequent in
News & Media
60%
Opinion
20%
Formal & Business
10%
Less common in
Science
5%
Encyclopedias
3%
Wiki
2%
Ludwig's WRAP-UP
The term "delusion" is a noun used to describe a false belief resistant to confrontation with facts. As Ludwig AI confirms, it's frequently found in News & Media contexts and expresses disagreement with an idea. When writing, remember that "delusion" describes a false belief whereas the word "illusion" refers to a misinterpretation of the senses. Using it correctly ensures clarity and precision, especially when discussing mental health or differing opinions.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
false belief
Focuses specifically on the incorrectness of the belief, omitting the psychological aspect of delusion.
misconception
Highlights the misunderstanding aspect, often implying a less severe or persistent false belief.
illusion
Emphasizes a sensory misinterpretation or deceptive appearance, rather than a fixed false belief.
fantasy
Suggests an imagined scenario, often pleasurable, but not necessarily believed to be real.
hallucination
Highlights sensory experiences without external stimuli, differing from a belief-based delusion.
pipe dream
Indicates an unrealistic hope or plan, typically associated with wishful thinking rather than mental illness.
self-deception
Highlights the act of deceiving oneself, implying a degree of awareness that is absent in true delusion.
erroneous perception
Focuses on the incorrectness of the perception, and does not have the strong medical connotation of "delusion".
cognitive distortion
Suggests a broader range of mental biases and irrational thoughts, not limited to fixed false beliefs.
wishful thinking
Highlights the influence of desires on beliefs, implying a conscious desire for something to be true.
FAQs
How is "delusion" used in the context of mental health?
In mental health, "delusion" refers to a fixed, false belief that is resistant to reason or evidence. It's a symptom of certain psychiatric conditions, such as schizophrenia or delusional disorder. For example, someone might have the "delusion of grandeur".
What are some common types of delusions?
Common types of delusions include "delusions of persecution" (belief of being targeted), "delusions of grandeur" (belief of exceptional abilities or status), and "delusions of reference" (belief that events have special significance for oneself).
What's the difference between a "delusion" and a "misconception"?
A "delusion" is a fixed, false belief that is strongly held despite contradictory evidence and often indicates a mental disorder. A "misconception", on the other hand, is a mistaken belief that can be corrected with information. Therefore, you can correct a misconception with reasonable information, while delusions are persistent even with facts.
When is it appropriate to use the term "delusion" in everyday conversation?
While "delusion" is primarily a clinical term, it can be used informally to describe a strong but clearly false belief. However, it's important to use it sensitively, especially when discussing someone's beliefs or opinions, to avoid causing offense. For instance, saying "It's a "delusion" to think that tax cuts will solve all economic problems" is acceptable, but avoid using it to describe personal beliefs without a good reason.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
90%
Authority and reliability
4.5/5
Expert rating
Real-world application tested