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Definition of fallacy

fallacy

/ˈfæl.ə.si/
fal · la · cy
Adverb:fallaciously
•
Plural:fallacies
•
Adjective:fallacious
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fallacy Lexical Profile

fallacy Game Scores & Validity

• noun

1

A mistaken belief or misconception, especially one based on unsound arguments or faulty reasoning.

Example

"The notion that money alone guarantees lasting happiness is a widespread fallacy."

2

A failure in reasoning that renders a logical argument invalid, or the quality of being logically flawed.

Example

"The professor pointed out the logical fallacy in the student's debate opening."

Synonyms
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Antonyms
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• Rhymes for fallacy

• Nearby Words

fall creek
fall creek falls
fallacious
fallacy
fallaway
fallback
fallen

Word Origin & Etymology

Borrowed in the late 15th century from Latin fallacia ('deception, trick, artifice'), from fallax ('deceptive'), ultimately derived from the verb fallere ('to deceive').

Cite this Entry

Wordmom. (2026). Definition of Fallacy. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/fallacy
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