A false notion.
Lack of accuracy or truth; falsity; deception
The condition of being false; lack of truth.
An erroneous or false idea
Find another word for erroneousness. In this page you can discover 8 synonyms, antonyms, idiomatic expressions, and related words for erroneousness, like: error, fallacy, falsehood, falseness, falsity, untruth, correct and true.