What does deluded mean?
"Deluded" is an adjective describing someone who holds a false belief, either because they have been actively deceived or because they cling to an idea despite clear evidence to the contrary. It is formed from the verb "delude," which comes from the Latin deludere, literally "to play false." A person may be described as deluded if they have been tricked by another's lies, or if their optimism is so misplaced that it amounts to self-deception — for example, "He was deluded into thinking the business would succeed without funding." The word frequently appears in the pattern "deluded into believing (something)" and often carries a tone of gentle pity or mild criticism rather than outright insult. It differs subtly from "delusional," which tends to imply a clinical or psychiatric condition involving persistent false beliefs. In everyday speech, calling someone "sadly deluded" suggests they are mistaken but perhaps not entirely blameworthy for it.
adjectiveBelieving something that is not true, typically because one has been deceived or is holding onto a false belief; misled in one's thinking.
- Deceived or misled into believing something untrue (often by another person).
- Holding a false belief stubbornly, often against clear evidence.
"He was deluded into thinking he could win the election without any support."
"She was deluded by his charm into lending him the money."
"Anyone who thinks that plan will work is sadly deluded."
The same Latin root that gives us 'ludicrous' — meaning 'playful' or 'laughable' — also gave us 'delude': to be made a fool of through play-acting.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of deluded
"Deluded" comes from the verb "delude," which entered English from the Latin deludere, composed of de- (implying reversal or negation) and ludere, meaning "to play" — hence originally "to play falsely with someone" or "to mock." This same root ludere gives English words such as "illusion," "prelude," and "ludicrous." The adjective form "deluded," meaning deceived or misled, developed naturally from past-participle use of the verb and has been common in English since at least the early modern period.
Related word forms
How deluded is actually used
Commonly used with 'into' when describing deception by someone ('deluded into doing something'). Often carries a slightly pitying or critical tone. The adjective derives from the verb 'delude'; it is not used as a noun in modern English.
Easily confused with deluded
'Delusional' typically refers to a psychiatric state of holding fixed false beliefs despite evidence, while 'deluded' more broadly means simply being deceived or mistaken.