## Examples
- It is a common fallacy that money always brings happiness.
- His conclusion rested on a logical fallacy that the professor quickly exposed.

## Derived Forms
- counterfallacy
- fallacious
- phallusy

## Related Forms
- fail
- fallible
- sophism

## Roots and Affixes
- Root: fallaci
- Root: fallace
- Root: fallācia

## Etymology
From Middle English fallaci, fallace, fallas, from Old French fallace, from Latin fallācia (“deception, deceit”), from fallāx (“deceptive, deceitful”), from fallere (“to deceive”).

## AI Etymology
Fallacy is from Middle English fallaci, fallace, fallas, from Old French fallace, from Latin fallācia (“deception, deceit”), from fallāx (“deceptive, deceitful”), from fallere (“to deceive”). Important recorded forms include fallaci (Middle English), fallace (Old French), and fallācia (Latin). Current senses include a mistaken belief based on faulty reasoning and a flawed argument that seems convincing but is actually invalid. The wider family includes derived forms such as counterfallacy, fallacious, and phallusy; related words such as fail, fallible, and sophism.

## Topics
- Religion & Belief
- Word Formation & Derivatives

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fallacy

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