fallacy

noun

ˈfa-lə-sē How to pronounce fallacy (audio)
Definition of fallacynext
1
as in delusion
a false idea or belief the once-common fallacy that girls just weren't any good at math

Synonyms & Similar Words

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Antonyms & Near Antonyms
2
as in deception
the quality or state of being false the fallacy of the notion of spontaneous generation was demonstrated by the Dutch naturalist Leeuwenhoek

Synonyms & Similar Words

Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of fallacy The sunk cost fallacy is the silent killer of rational decision-making. — Daniel S. Levine, PEOPLE, 12 May 2026 Like being able to recognize logical fallacies and how to have media literacy. — Phillip Sitter, Des Moines Register, 7 May 2026 For example, the false dilemma logical fallacy has become a very popular way to persuade people to incorrectly believe there are only two options. — Kaitlyn Schallhorn, Oc Register, 4 May 2026 Since the city adopted the video release policy more than a decade ago, experience has repeatedly demonstrated the fallacy of limiting inquiry to the precise moment when a police officer fires their gun. — Jamie Kalven, Chicago Tribune, 29 Apr. 2026 See All Example Sentences for fallacy
Recent Examples of Synonyms for fallacy
  1. delusion
  2. deception
  3. myth
  4. deceptiveness
  5. error
  6. falseness
  7. illusion
  8. falsehood
Noun
  • The Mayo Clinic defines the mental health condition as typically marked by hallucinations, delusions, depression, and mania.
    — Leigh Blickley, Entertainment Weekly, 29 Sep. 2026
  • Hill became increasingly paranoid and developed delusions that she was being surveilled.
    — Rebecca White, New York Daily News, 28 Sep. 2026
Definition of delusion
Noun
  • Most often, this would be a network of fake accounts discovered by social media companies as part of their efforts to eliminate bots, scams, and online deception on their platforms.
    — RENÉE DIRESTA, Foreign Affairs, 5 Oct. 2026
  • In writing her for the series, Kazan realized Cathy, despite her deceptions, is almost always telling the truth.
    — Lexy Perez, HollywoodReporter, 4 Oct. 2026
Definition of deception
Noun
  • Best Bedroom Furniture Deals Yes, high-quality, affordable bedroom furniture is not a myth.
    — Audrey Lee, Architectural Digest, 7 Oct. 2026
  • Nalla Roberts has been fascinated with tales like this for years, growing obsessed with Greek myths in her childhood.
    — Olivia Wakim, AJC.com, 7 Oct. 2026
Definition of myth
Noun
  • Of course, the retort is that this would be irritating and exasperating to be continually deluged with alerts about AI deceptiveness.
    — Lance Eliot, Forbes.com, 24 Aug. 2025
  • Beyond the deceptiveness of the narrow material view, spiritual light and hope are always present to be found and felt.
    — Sue Brightman, Christian Science Monitor, 3 Jan. 2025
Definition of deceptiveness
Noun
  • On Friday, the Rams waived punt returner Xavier Smith, who fumbled in last season’s NFC championship game and made several decision-making errors against the Broncos.
    — Gary Klein, Los Angeles Times, 3 Oct. 2026
  • Days later, campus administration clarified that their initial communication was an error.
    — Tarini Mehta, Sacbee.com, 2 Oct. 2026
Definition of error
Noun
  • The falseness of the medium, though, jibed with the falseness of most attempts, throughout American history, to make sense of this enormous, strange man.
    — Christopher Hooks, Harpers Magazine, 23 June 2026
Definition of falseness
Noun
  • But recent Ukrainian drone strikes on Russia’s oil refineries have led to widespread fuel shortages, shattering the illusion that the consequences of the conflict are far removed from ordinary Russians.
    — Zahra Ullah, CNN Money, 1 Oct. 2026
  • Use your illusion Hancock and his team combined multiple lines of evidence to test their hypothesis that the colorful wing patterns of butterflies served as a form of motion dazzle.
    — Jennifer Ouellette, ArsTechnica, 30 Sep. 2026
Definition of illusion
Noun
  • But at the prospect of engagement dropping by even one percent, Zuckerberg rules out any serious measures against content violation, making Charlie furious by refusing to consider policing political ads for falsehoods.
    — David Rooney, HollywoodReporter, 7 Oct. 2026
  • Despite this online onslaught, many actors across sub-Saharan Africa are actively standing up to combat falsehoods with facts.
    — the Monitor's Editorial Board, Christian Science Monitor, 6 Oct. 2026
Definition of falsehood

Browse Nearby Words

fallaciousness
fallacy
fal-lal
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Cite this Entry

“Fallacy.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/fallacy. Accessed 9 Oct. 2026.

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More from Merriam-Webster on fallacy

Britannica.com: Encyclopedia article about fallacy

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