Synonyms of fallacy

fallacy

noun

ˈfa-lə-sē 

1

as in delusion

a false idea or belief

the once-common fallacy that girls just weren't any good at math

Synonyms & Similar Words

• delusion
• myth
• error
• illusion
• misconception
• superstition
• misunderstanding
• falsehood
• misbelief
• untruth
• hallucination
• falsity
• distortion
• pretense
• lie
• misrepresentation
• old wives' tale
• fiction
• misperception
• misinterpretation
• factoid
• misapprehension
• tale
• misstatement
• miscomprehension
• misinformation
• inaccuracy
• sophism
• misjudgment
• sophistry
• half-truth
• story
• fib
• misknowledge
• misreport

Antonyms & Near Antonyms

• truth
• verity

2

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

• deception
• deceptiveness
• delusion
• falseness
• fallaciousness
• falsehood
• erroneousness
• untruth
• falsity
• spuriousness
• speciousness
• inaccuracy
• dishonesty
• incorrectness
• untruthfulness
• mendacity
• mendaciousness

Antonyms & Near Antonyms

• truth
• verity
• accuracy
• correctness
• actuality
• genuineness
• credibility
• truthfulness
• honesty
• trustworthiness
• veracity
• factuality
• factualness

Example Sentences

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