Logical fallacies terms and short definitions

Appeal to Force

Appeal to Force

This argument uses force, the threat of force, or some other unpleasant backlash to make the audience accept a conclusion.

Ad Hominem Fallacy

Attacking or praising the people who make an argument rather than discussing the argument itself.

Bandwagon Approach

“Everybody is doing it.” This argument asserts that, since the majority of people believes an argument or chooses a particular course of action, the argument must be true or the course of action must be the best one. “Whenever you find yourself on the side of the majority, it's time to pause and reflect.” --Mark Twain.

Appeal to Tradition

This line of thought asserts that a premise must be true because people have always believed it or done it.

Appeal to Improper Authority

An appeal to an improper authority, such as a famous person or a source that may not be reliable.

Appeal to Biased Authority

In this sort of appeal, the authority is one who truly is knowledgeable on the topic, but unfortunately one who may have professional or personal motivations that render that judgment suspect.

Begging the Question

The fallacy is committed when someone has made a conclusion based on a premise that lacks support. For example, stating that “chinaberries are good for people because they grow on trees.” The unsupported premise here is that things that grow on trees are inherently good for people.

Circular Reasoning

a subtype of begging the question. Often the authors word the two statements sufficiently differently to obscure the fact that the same proposition occurs as both a premise and a conclusion. For example: A confused student argues: “You can’t give me a C.  I’m an A student!” Another Example: “God exists. We know this because the Bible says so. And we know the Bible is correct because the Bible was written by God."

Hasty Generalization

Mistaken use of inductive reasoning when there are too few samples to prove a point.

Misleading Statistic

Suppose an individual argues that women must be incompetent drivers, and he points out that last Tuesday at the Department of Motor Vehicles, 50% of the women who took the driving test failed.

False Causality Fallacy (Correlation Fallacy)

This fallacy establishes a cause/effect relationship that does not exist. There are various Latin names for various analyses of the fallacy: "After this, therefore because of this." This type of false cause occurs when the writer mistakenly assumes that, because the first event preceded the second event, it must mean the first event must have caused the later one.

Red Herring Fallacy

A red herring is a deliberate attempt to change the subject or divert the argument from the real question at issue.

Straw Man Fallacy

a writer creates an oversimplified, easy-to-refute argument, places it in the mouth of his opponent, and then tries to "win" the debate by knocking down that empty or trivial argument.

Slippery Slope Fallacy

the speaker argues that, once the first step is undertaken, a second or third step will inevitably follow, much like the way one step on a slippery incline will cause a person to fall and slide all the way to the bottom.

False Dilemma Fallacy

This fallacy occurs when a writer builds an argument upon the assumption that there are only two choices or possible outcomes when actually there are several.

Faulty Analogy

Relying only on comparisons to prove a point rather than arguing deductively and inductively.

Equivocation

Using a word in a different way than the author used it in the original premise, or changing definitions halfway through a discussion.

Stacking the Deck

In this fallacy, the speaker "stacks the deck" in her favor by ignoring examples that disprove the point, and listing only those examples that support her case.

Argument from the Negative

Arguing from the negative asserts that, since one position is untenable, the opposite stance must be true.

Loaded Question Fallacy

Phrasing a question or statement in such a way as to imply another unproven statement is true without evidence or discussion.