- a deceptive, misleading, or false notion, belief, etc.: That the world is flat was at one time a popular fallacy.
- a misleading or unsound argument.
- deceptive, misleading, or false nature; erroneousness.
- any of various types of erroneous reasoning that render arguments logically unsound.
- deception.
- an incorrect or misleading notion or opinion based on inaccurate facts or invalid reasoning
- unsound or invalid reasoning
- the tendency to mislead
- an error in reasoning that renders an argument logically invalid
