nontruth
/ˌnɑnˈtruθ/
noun
- A statement or idea that is not true; a falsehood.
- The rumor was a complete nontruth, spread by someone who didn't know the facts.
- Historians worked to correct the nontruth that had been taught for decades.
- She realized that the advertisement contained a nontruth about the product's benefits.
Antonyms