What does delusory mean?
Delusory is an adjective used to describe something that deceives — that creates a false impression of reality, truth, or possibility. When hopes, promises, appearances, or beliefs are described as delusory, the implication is that they lead people toward mistaken conclusions or unfounded confidence. The word carries a formal, often literary tone and appears most frequently in philosophical, psychological, and critical writing, where precision about deception matters. It differs subtly from its close relative 'illusory': an illusion may simply fail to exist, but something delusory tends to foster an active delusion in the mind of the beholder. Typical collocations include 'delusory hopes', 'a delusory sense of security', and 'delusory promises'. Derived forms include the adverb 'delusively' and the noun 'delusiveness'. For writers seeking a word that emphasises not just unreality but the seductive quality of falsehood, delusory is a precise and evocative choice.
adjectiveCreating or tending to create a false or misleading impression; deceptive. It describes something that appears real, true, or attainable but is in fact illusory.
- Creating or tending to create false or misleading impressions; deceptive.
- (Less commonly) Relating to or characterized by delusion.
"The promise of quick riches proved delusory, luring investors into a scheme built on nothing."
"The committee dismissed the report's findings as resting on delusory assumptions about market growth."
"He clung to the delusory belief that his fortunes would soon reverse."
'Delusory' and 'ludicrous' are cousins — both trace back to the Latin 'ludere', meaning to play: a delusion is literally something that 'plays with' your mind.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of delusory
Delusory derives from the Latin verb 'deludere', meaning 'to play false' or 'to mock', formed from 'de-' (expressing reversal or negation) and 'ludere' ('to play'). The word entered English in the mid-17th century, alongside related forms such as 'delusion' and 'delude', which came through the same Latin root. It shares this origin with 'ludicrous', 'elude', and 'illusion' (via Latin 'illudere'), all of which preserve the ancient connection between playing games and deceiving the mind.
Related word forms
How delusory is actually used
Formal register; more common in written than spoken English. Slightly more literary or academic in tone than its near-synonym 'illusory'. Often used attributively before abstract nouns such as hopes, beliefs, promises, or appearances.
Easily confused with delusory
While both mean deceptive or unreal, 'illusory' typically describes something that merely seems to exist (like a mirage), whereas 'delusory' often carries a stronger connotation of actively deceiving or fostering a delusion.