fallacy
/ˈfæləsi/noun
An idea that many people believe but that is false, often because it is based on faulty reasoning.
Example sentences
- “It's a common fallacy that lightning never strikes the same place twice.”
- “The belief that money buys happiness is a fallacy.”
- “His argument rests on the fallacy that older methods are always better.”
Typical frame: 'It is a fallacy that...'. In logic, a fallacy is a specific type of mistake in reasoning, such as attacking the person instead of the argument.