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View synonyms for

fallacy

[ fal-uh-see ]

noun

plural fallacies.
  1. a deceptive, misleading, or false notion, belief, etc.:

    That the world is flat was at one time a popular fallacy.

    Synonyms: , ,

  2. a misleading or unsound argument.
  3. deceptive, misleading, or false nature; erroneousness.
  4. Logic. any of various types of erroneous reasoning that render arguments logically unsound.
  5. Obsolete. deception.


fallacy

/ ˈæəɪ /

noun

  1. an incorrect or misleading notion or opinion based on inaccurate facts or invalid reasoning
  2. unsound or invalid reasoning
  3. the tendency to mislead
  4. logic an error in reasoning that renders an argument logically invalid
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

fallacy

  1. A false or mistaken idea based on faulty knowledge or reasoning. For example, kings who have divorced their wives for failing to produce a son have held to the fallacy that a mother determines the sex of a child, when actually the father does. ( See sex chromosomes .)
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Word History and Origins

Origin of fallacy1

First recorded in 1350–1400; from Latin ڲ峦 “a trick, deceit,” from ڲ峦- (stem of ڲ ) “deceitful” + -ia -y 3; replacing Middle English fallace, from Middle French
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Word History and Origins

Origin of fallacy1

C15: from Latin ڲ峦 , from fallax deceitful, from fallere to deceive
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Example Sentences

Examples have not been reviewed.

Federal judges have described Trump’s actions as “illegal” or “shocking,” with one judge calling the administration’s insistence that it has no obligation to return Abrego Garcia to the U.S. a “fallacy.”

From

“It’s a complete fallacy and a red herring to suggest that, since the state of the emergency is over, the funding should end, too.”

From

Trump added that Ukraine needed fresh elections "at some point", repeating a Putin fallacy that Zelensky was no longer a legitimate leader, even though Ukraine is under martial law precisely because of Russia's war.

From

A sunk cost fallacy then occurs if you lean into the sunk cost by putting more resources toward it, even though that doesn't recoup what's already lost.

From

“There’s a thing called ‘arrival fallacy,’ which is that the horizon is just always receding.

From

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fallaciousfallacy of composition