fallacy

Definitions

A mistaken belief, especially one based on unsound argument.

A failure in reasoning that renders an argument invalid.

Examples

It is a common fallacy to assume that correlation always implies causation.

The politician's argument relied on the fallacy that everyone who disagrees with him is unpatriotic.

Synonyms

misconception delusion falsehood error in reasoning sophistry illusion misbelief

Antonyms

truth fact verity certainty validity reality sound reasoning