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Home / Informal Fallacies / Proof by Verbosity

Proof by Verbosity

informal Fallacy

Also called argumentum verbosum, proof by verbosity is an argument that is far too complicated, lengthy, or verbose for an opponent to reasonably address all the particulars. The sheer volume of words, claims, or sub-arguments is used to create the impression of a strong case, even when the reasoning is weak or unsound. This should not be confused with proof by intimidation (or argumentum ad verecundiam), where someone's reputation or credentials are used to pressure others into accepting a claim.

Example of Proof by Verbosity

  • When asked to justify why the proposed tax plan would work, the politician launched into a 20-minute response filled with tangential historical anecdotes, obscure economic jargon, and dozens of loosely connected statistics, leaving no time for rebuttal. The sheer volume of material made it impossible to address each point, creating the illusion of a thorough argument.
  • The professor, through the most eloquent of words and the most beautiful prose, divined the conclusion that one plus one equals three. This highly impressive display of mastery over language and oratory skill proves that one plus one equals three. No amount of flowery language can prove that one plus one is anything other than two.

In more detail

Proof by Verbosity is a logical fallacy that occurs when someone attempts to prove their point by using an overwhelming volume of words, arguments, or details, making it impractical for an opponent or audience to address every claim. The sheer quantity of material creates the illusion that the argument is well-supported, even when the individual points are weak, irrelevant, or unsound. This fallacy is sometimes called argumentum verbosum or the "Gish Gallop" (when deployed in debate by rapidly presenting many arguments in succession).

The fallacy exploits a simple psychological reality: when confronted with an enormous amount of information, people tend to assume that at least some of it must be correct, and opponents may not have the time or energy to refute every point. This can create a false sense of thoroughness and rigor where none actually exists.

Proof by Verbosity can take several forms:

  • Volume of arguments: Presenting a large number of weak or tangential arguments, so that addressing all of them becomes impractical.
  • Unnecessary complexity: Using convoluted language, jargon, or overly complex sentence structures to obscure the weakness of the underlying reasoning.
  • Excessive detail: Burying the core argument under mountains of loosely related facts, statistics, or anecdotes, making it difficult for the audience to identify and evaluate the actual claim.

This fallacy is common in political debates, academic disputes, and online arguments. It is important to recognize that the strength of an argument depends on the quality of its reasoning and evidence, not on the quantity of words used. When evaluating a verbose argument, it can be helpful to identify the core claim and ask whether it is actually supported by sound reasoning, rather than being distracted by the surrounding volume of material.