- Today's Word
Fallacious
fuh-LAY-shus
Definition
- (adjective) Based on a mistaken belief or misleading reasoning.
- Logically unsound or deceptive.
Example
His argument was fallacious, relying on false assumptions rather than solid evidence.
Fun Fact
“Fallacious” comes from the Latin fallacia, meaning “deception” or “trickery.” The term is closely linked to logical fallacies—errors in reasoning that often appear persuasive but are fundamentally flawed. Common examples include the slippery slope fallacy and ad hominem attacks. Recognizing fallacious reasoning is a key skill in debate, critical thinking, and media literacy, helping people avoid being misled by faulty logic.
(adjective) Devoid of intelligence, substance, or meaningful content; empty in a way that is made worse by the appearance of fullness.
The panel discussion was so vacuous — four articulate people saying nothing of substance for ninety minutes — that the audience left feeling vaguely cheated by their own attention.
Vacuous derives from the Latin vacuus, meaning “empty” or “void,” rooted in vacare — “to be empty” or “to be free.” The same root gives us vacuum, vacant, vacation — all words built around the idea of emptiness or absence. It entered English in the 17th century, initially used in scientific contexts to describe a literal vacuum before acquiring its cutting figurative sense of a mind or expression that contains nothing worth engaging with.