Logical Fallacies

LogFall

A practical logical-fallacies reference with clear explanations, usable examples, and teaching tools.

Category

Linguistic

Confusion created by wording, ambiguity, framing, or unstable definitions.

Entries

15 fallacies in this category.

Diagnostic prompt

Has the wording shifted, blurred, or changed meaning mid-argument?

Category vs. family

A category is a diagnostic lens, so a fallacy may appear in more than one category. A family is the broader umbrella that gives the fallacy its single main home.

Contextomy

Occurs when words are selectively excerpted from their original context in a way that changes or distorts what the speaker meant.

TacticalLinguistic
Intermediate High school

Continuum fallacy

Occurs when a claim is rejected simply because the concept involved has blurry boundaries rather than a perfectly sharp cutoff.

ConceptualLinguistic
Intermediate High school

Definist fallacy

Occurs when a substantive question is illegitimately 'solved' by defining one contested concept into another.

LinguisticConceptual
Intermediate High school

Equivocation

Occurs when a key word or phrase slides between different meanings inside the same argument, creating the illusion of support.

Linguistic
Foundational Middle school+

Equivocation fallacy

Occurs when a broad or harmless sense of a word is used to insinuate a narrower, stronger, or more loaded sense of the same word.

Linguistic
Intermediate High school

Etymological fallacy

Occurs when a word's original or historical meaning is treated as if it controlled the word's present meaning.

Linguistic
Intermediate High school

Fallacy of necessity

Occurs when a condition that is necessary given someone's current description is treated as if it were permanently or universally necessary in the real world.

LinguisticConceptual
Intermediate High school

Genetic fallacy

Occurs when a claim, practice, or idea is judged mainly by its origin rather than by its present content, evidence, or merits.

LinguisticConceptual
Advanced Intro college

Intentional fallacy

Occurs when the creator's intended meaning is treated as irrelevant in contexts where that intention is actually important to understanding the work or statement.

PerspectivalLinguistic
Intermediate High school

No True Scotsman

Occurs when someone protects a generalization from counterexamples by redefining the group with an ad hoc 'real' or 'true' membership test.

ConceptualLinguistic
Foundational Middle school+

Overwhelming exception

Occurs when a general principle is padded with so many exceptions that it no longer guides action or says much of substance.

LinguisticConceptual
Advanced Intro college

Proof by verbosity

Occurs when a claim is protected by an avalanche of words, side points, jargon, or branching assertions that overwhelm reasonable scrutiny and create the illusion of dept...

TacticalLinguistic
Intermediate High school

Reification

Occurs when an abstraction is spoken of as if it were a concrete agent or thing in a way that misleads rather than merely using harmless metaphor.

ConceptualLinguisticPerspectival
Intermediate High school

Semantic pixelization

Occurs when a fuzzy, graded, or probabilistic position is forced into unnaturally sharp categories so it becomes easier to attack.

Linguistic
Intermediate High school

Suppressed correlative

Occurs when one term in a meaningful contrast is redefined so broadly or so narrowly that its opposing term can no longer do any work.

ConceptualLinguistic
Intermediate High school