FALLACY Synonyms: 61 Similar and Opposite Words

fallacy

noun

ˈfa-lə-sē

Definition of fallacy

as in delusion

a false idea or belief the once-common fallacy that girls just weren't any good at math

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

truth
verity

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

Noun

Symptoms of postpartum psychosis can include delusions or hallucinations that can prompt suicidal or homicidal action, according to the American College of Obstetricians and Gynecologists.

— ABC News, ABC News, 28 Aug. 2026
That’s the sign of an overmatched team, and one that should be far, far away from any delusions of postseason grandeur.

— Grant Brisbee, New York Times, 25 Aug. 2026

Definition of delusion

Noun

Prevention of fraud, deception and public accountability are reasons given for this suggestion.

— Chicago Tribune, Chicago Tribune, 24 Aug. 2026
As the investigation unfolded, what initially appeared to be a daring ransom scheme evolved into a complex story of obsession, deception, and unexpected motives.

— Andreas Wiseman, Deadline, 21 Aug. 2026

Definition of deception

Noun

Visitors are invited to travel across time and place to notice how societies around the world tended to weave similar, parallel myths.

— Devorah Lauter, ARTnews.com, 28 Aug. 2026
But cultural myths and urban legends have also stereotyped them into Halloween mascots, demonic beings and carriers of diseases.

— Shi En Kim, AZCentral.com, 28 Aug. 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

This is the illusion that the Rankine of Triage has abandoned.

— Charles Finch, The Atlantic, 28 Aug. 2026
The illusion of molten steel was basically water and mineral oil mixed with a little powdered sugar; creative lighting and heaters placed below the cameras—plus a few CGI sparks in the background—did the rest.

— ArsTechnica, ArsTechnica, 28 Aug. 2026

Definition of illusion

Noun

Another example of say anything, even falsehoods, to get elected.

— Voice of the People, New York Daily News, 24 Aug. 2026
Getty Images As wildfires sweep Europe and North America, falsehoods about their causes and the nature of climate change are spreading like, well, wildfire.

— David Vetter, Forbes.com, 19 Aug. 2026

Definition of falsehood

Browse Nearby Words

fallaciousness

fallacy

fal-lal

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“Fallacy.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/fallacy. Accessed 1 Sep. 2026.

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Synonyms of fallacy

noun

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