1
as in unreasonable
not using or following good reasoning
it's fallacious to say that something must exist because science hasn't proven its nonexistence
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Antonyms & Near Antonyms
2
as in misleading
tending or having power to deceive
consumers who harbor the fallacious belief that credit-card spending will never catch up with them
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Example Sentences
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Recent Examples of fallacious
Lawyers who argued for his ouster on behalf of the National Assembly said the claims by Mr. Yoon were fallacious.
—
Choe Sang-Hun, New York Times, 1 Apr. 2025
However, not all slippery slope arguments are fallacious.
—Mark Travers, Forbes.com, 26 Mar. 2025
That will in turn spread on social media, which often plays a disproportional role in boosting these disinformation efforts by providing nearly unlimited platforms for unfiltered content and fallacious and deceptive claims.
—Peter Suciu, Forbes, 23 Dec. 2024
But hard evidence in both our nation’s history and our present shows that this reasoning is fallacious.
—Ana Raquel Minian, TIME, 30 May 2024
See All Example Sentences for fallacious
Choe Sang-Hun, New York Times, 1 Apr. 2025
However, not all slippery slope arguments are fallacious.
—Mark Travers, Forbes.com, 26 Mar. 2025
That will in turn spread on social media, which often plays a disproportional role in boosting these disinformation efforts by providing nearly unlimited platforms for unfiltered content and fallacious and deceptive claims.
—Peter Suciu, Forbes, 23 Dec. 2024
But hard evidence in both our nation’s history and our present shows that this reasoning is fallacious.
—Ana Raquel Minian, TIME, 30 May 2024
See All Example Sentences for fallacious
Recent Examples of Synonyms for fallacious
Adjective
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The vast majority of post commenters assured the OP that her feelings are completely valid and that her mother is being unreasonable.—
Toria Sheffield,
People.com,
7 June 2025
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But leading the team to the Finals is not an unreasonable request.—
Troy Renck,
Denver Post,
6 June 2025
Adjective
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To many watching, Elon Musk’s decision to publicly insult President Trump seemed self-destructive, if not outright irrational.—
Joel Shulman,
Forbes.com,
8 June 2025
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And then the irrational with the Tom Thibodeau move.—
Ira Winderman,
Sun Sentinel,
5 June 2025
Adjective
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Last year, the Biden administration's Transportation Department opened an inquiry ordering American, Delta Air Lines, Southwest and United to provide records and submit reports to ensure consumers do not face unfair, deceptive, or anticompetitive practices.—
David Shepardson,
USA Today,
3 June 2025
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The quest to build human-level AI agents using techniques known to produce deceptive tendencies, Bengio says, is comparable to a car speeding down a narrow mountain road, with steep cliffs on either side, and thick fog obscuring the path ahead.—
Harry Booth,
Time,
3 June 2025
Adjective
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Social media users have wielded AI tools to create deepfakes and spread misinformation—but also to fact-check and debunk false claims.—
Andrew R. Chow,
Time,
12 June 2025
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On Wednesday, Dobbins addressed the story about his false claims.—
Jen McCaffrey,
New York Times,
12 June 2025
Adjective
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This secret-keeping tradition kept President François Mitterrand’s illegitimate daughter hidden for years.—
Saskya Vandoorne,
CNN Money,
27 May 2025
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Maduro, whose reelection last year to a third term has been condemned internationally as illegitimate, also has cracked down on his political opponents.—
Mark Sherman,
Chicago Tribune,
19 May 2025
Adjective
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Which was probably to be expected, given that making a new entry in this franchise doesn’t require jumping through too many illogical hoops or reinventing an outdated conceit.—
Bilge Ebiri,
Vulture,
16 May 2025
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His insight and unconventional approach to understanding human behavior lead him and the team on a series of intense, unexpected journeys to solve illogical puzzles and perplexing mysteries.—
Nellie Andreeva,
Deadline,
9 May 2025
Cite this Entry
“Fallacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/fallacious. Accessed 15 Jun. 2025.
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