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
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
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
See All Example Sentences for 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
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
See All Example Sentences for fallacious
Recent Examples of Synonyms for fallacious
Adjective
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State of Ohio et al. v. NCAA (2024): A coalition of states challenged the NCAA’s remaining restrictions on transfers, arguing that the adjusted rule still imposed unreasonable restraint on athletes.—
Nick LoMaglio,
Forbes.com,
29 Aug. 2025
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That doesn’t seem like an unreasonable body count for someone who’s about to default on his mortgage — someone who’s already suffered the indignity of being forced to cancel his family’s Netflix account.—
David Ehrlich,
IndieWire,
29 Aug. 2025
Adjective
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On the irrational front, Cramer pointed to recent IPOs such as Circle, Figma and Bullish, that each saw explosive gains after their debuts.—
Ali McCadden,
CNBC,
14 Aug. 2025
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But exactly the opposite needs to happen: the patient needs to enact her struggle in the room, to be messy, irrational, resentful, out of control.—
Leslie Jamison,
New Yorker,
4 Aug. 2025
Adjective
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These emails are loaded with deceptive links that lead to malware infections, and the consequences can be severe.—
Kurt Knutsson,
FOXNews.com,
14 Aug. 2025
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The Center for Democracy and Technology, Electronic Frontier Foundation, Knight First Amendment Institute at Columbia University and American Civil Liberties Union say the software companies push deceptive marketing practices, exploit fear, normalize invasion of privacy and erode trust.—
Taylor Seely,
AZCentral.com,
13 Aug. 2025
Adjective
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As a part of the settlement, the false electors acknowledged their actions were used in an attempt to overturn an election.—
Jessie Opoien,
jsonline.com,
23 Aug. 2025
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It’s been a huge year for lashes: Brown and colored mascaras made a comeback, and people have been having fun with false lashes again.—
Sophia Panych,
Allure,
22 Aug. 2025
Adjective
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The judge presiding over the case, William Alsup, had suggested in a ruling made in July that even if the AI training use might be considered fair use, this initial acquisition of works was illegitimate and would need compensation.—
Beatrice Nolan,
Fortune,
27 Aug. 2025
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Sovereign citizens believe the government is illegitimate.—
Reuters,
CNN Money,
26 Aug. 2025
Adjective
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Further, this assumes AI systems are actually free from the biases present in their training data, which is illogical.—
Luis E. Romero,
Forbes.com,
27 Aug. 2025
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Other red flags include excessive washing, and avoidance of certain toys or places due to fears and rituals that seem illogical or disconnected from the situation.—
Daniella Gray,
MSNBC Newsweek,
16 Aug. 2025
Cite this Entry
“Fallacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/fallacious. Accessed 4 Sep. 2025.
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