Definitions

This list has been gleaned from diverse sources, and will be populated steadily week by week with new definitions. Don't be alarmed by the number of fallacies, what is happening here is that a single fallacy may have many names, and I'm listing all that I find, which should make searching for a fallacy easy.

Click on a word or phrase to see its definition. (only GREY terms are functional)

  • accent fallacy - informal
  • accident fallacy - informal
  • ad antiquitatem - informal
  • ad hominem fallacy - informal
  • affirmative conclusion fallacy - formal
  • affirmative proposition
  • affirming the alternative fallacy - formal
  • affirming the consequent fallacy - formal
  • amazing Familiarity fallacy - informal
  • ambiguity
  • ambiguous assertion fallacy - informal
  • amphiboly fallacy - informal
  • analysis
  • appeal to age fallacy - informal
  • appeal to anonymous authority fallacy - informal
  • appeal to authority fallacy - informal
  • appeal to belief fallacy - informal
  • appeal to coincidence fallacy - informal
  • appeal to common practice fallacy - informal
  • appeal to complexity fallacy - informal
  • appeal to consequences of belief fallacy - informal
  • appeal to emotion fallacy - informal
  • appeal to false authority
  • appeal to fear fallacy - informal
  • appeal to flattery - informal
  • appeal to force fallacy - informal
  • appeal to ignorance fallacy - informal
  • appeal to novelty fallacy - informal
  • appeal to pity fallacy - informal
  • appeal to popularity fallacy - informal
  • appeal to poverty fallacy - informal
  • appeal to ridicule fallacy - informal
  • appeal to spite fallacy - informal
  • appeal to the people fallacy - informal
  • appeal to popular opinion - informal
  • appeal to tradition fallacy - informal
  • appeal to widespread belief fallacy - informal
  • argument
  • argument by bafflement fallacy - informal
  • argument by demanding impossible perfection fallacy - informal
  • argument by doggedness fallacy - informal
  • argument by emotive language fallacy - informal
  • argument by fast talking fallacy - informal
  • argument by generalization fallacy - informal
  • argument by gibberish fallacy - informal
  • argument by half truth fallacy - informal
  • argument by laziness fallacy - informal
  • argument by personal charm fallacy - informal
  • argument by pigheadedness fallacy - informal
  • argument by poetic language fallacy - informal
  • argument by prestigious jargon fallacy - informal
  • argument by question fallacy - informal
  • argument by repetition fallacy - informal
  • argument by rhetorical question fallacy - informal
  • argument by scenario fallacy - informal
  • argument by selective observation fallacy - informal
  • argument by selective reading fallacy - informal
  • argument by slogan fallacy - informal
  • argument by uninformed opinion fallacy - informal
  • argument form
  • argument from adverse consequences fallacy - informal
  • argument from age fallacy - informal
  • argument from authority fallacy - informal
  • argument from design fallacy - informal
  • argument from false authority fallacy - informal
  • argument from small numbers fallacy - informal
  • argument from spurious similarity fallacy - informal
  • argument of the beard fallacy - informal
  • argument to the future fallacy - informal
  • argumentum ad antiquitatem fallacy - informal
  • argumentum ad baculum fallacy - informal
  • argumentum ad hominem fallacy - informal
  • argumentum ad ignoratiam fallacy - informal
  • argumentum ad misericordiam fallacy - informal
  • argumentum ad nauseam fallacy - informal
  • argumentum ad negantem fallacy - informal
  • argumentum ad numerum fallacy - informal
  • argumentum ad petitio principii fallacy - informal
  • argumentum ad populum fallacy - informal
  • argumentum ad traditio fallacy - informal
  • argumentum ad verecundiam fallacy - informal
  • Aristotelian logic
  • assuming the answer fallacy - informal
  • assumption
  • attribute
  • axiom
  • bad analogy fallacy - informal
  • bandwagon fallacy - informal
  • begging the question fallacy - informal
  • belief
  • biased sample fallacy - informal
  • bifurcation fallacy - informal
  • bivalent logic
  • burden of proof fallacy - informal
  • camel's nose fallacy - informal
  • categorical logic
  • categorical proposition
  • categorical syllogism
  • categorical term
  • category
  • category mistake
  • changing the subject fallacy - informal
  • circular definition
  • circular fallacy - informal
  • circulus in demonstrando fallacy - informal
  • cliche thinking fallacy - informal
  • common sense fallacy - informal
  • complex question fallacy - informal
  • composition fallacy - formal
  • composition fallacy - informal
  • conclusion
  • conditional
  • confusing cause and effect fallacy - informal
  • confusing correlation and causation fallacy - informal
  • conjunction / Conj.
  • conjunction compound statement
  • consistency
  • constant
  • contradiction
  • contradictories
  • converse accident fallacy - informal
  • converting conditional fallacy - formal
  • counter-example
  • counterfactual
  • crucial experiment fallacy - informal
  • deduction
  • deductive argument
  • definition
  • denying the antecedent
  • Digression fallacy - informal
  • dilemma
  • diminished claim fallacy - informal
  • disproof by fallacy fallacy - informal
  • division fallacy - formal
  • efficient cause
  • emanation
  • empirical
  • equivalence
  • equivocation fallacy - informal
  • error of fact fallacy - informal
  • esse est percipi
  • euphemism fallacy - informal
  • evidence
  • exception that proves the rule fallacy - informal
  • excluded middle fallacy - informal
  • exclusive premises
  • existential fallacy
  • extended analogy fallacy - informal
  • extension fallacy - informal
  • fact
  • failure to assert fallacy - informal
  • failure to state fallacy - informal
  • fallacy of many questions - informal
  • fallacy of origins - informal
  • fallacy of virtue - informal
  • false
  • false cause fallacy - informal
  • false compromise fallacy - informal
  • false dichotomy fallacy - informal
  • false dilemma fallacy - informal
  • false emphasis fallacy - informal
  • falsifiability
  • faulty dilemma fallacy - informal
  • formal fallacy
  • gambler's fallacy
  • general rule fallacy - informal
  • genetic fallacy - informal
  • guilt by association fallacy - informal
  • hasty generalization fallacy - informal
  • having your cake fallacy - informal
  • hypothesis
  • hypothesis contrary to fact fallacy - informal
  • hypothetical imperative
  • hypothetical syllogism fallacy - informal
  • idea
  • ignoring a common cause fallacy - informal
  • illicit major
  • illicit minor
  • indirect proof
  • induction
  • inductive argument
  • inference
  • informal fallacy
  • ingnorantio elenchi
  • intuition
  • invalid
  • irony
  • irrelevant conclusion fallacy - informal
  • joint method fallacy - informal
  • justification
  • knowledge
  • law of parsimony
  • least plausible hypothesis fallacy - informal
  • lies fallacy - informal
  • logic
  • loaded question fallacy - informal
  • logical form
  • logical symbols
  • major premise
  • major term
  • material cause
  • meaning
  • meaningless questions fallacy - informal
  • method of difference fallacy - informal
  • method of doubt
  • Method of Residues
  • middle ground fallacy - informal
  • middle term
  • mind reading fallacy - informal
  • minor premise
  • minor term
  • misdirection fallacy - informal
  • misleading vividness fallacy - informal
  • modal logic
  • moving the goalposts fallacy - informal
  • naturalistic fallacy - informal
  • necessary
  • negation
  • negative proposition
  • non causa pro causa fallacy - informal
  • non sequitur
  • normative ethics
  • not invented here fallacy - informal
  • objective
  • open question
  • opinion
  • outdated information fallacy - informal
  • paradigm
  • petitio principii fallacy - formal
  • pious fraud fallacy - informal
  • poisioning the well fallacy - informal
  • post hoc fallacy - informal
  • post hoc, ergo propter hoc fallacy - informal
  • postulate
  • premise
  • presupposition
  • proof
  • proposition
  • questionable cause fallacy - informal
  • raising the bar fallacy - informal
  • reason
  • recursive
  • red herring fallacy - informal
  • reductio ad absurdum - informal
  • reductive fallacy - informal
  • relativist fallacy - informal
  • scare tactics fallacy - informal
  • self-evident
  • semantics
  • simpliciter
  • sine qua non
  • singular proposition
  • slippery slope fallacy - informal
  • sound
  • special pleading fallacy - informal
  • spotlight fallacy
  • stacking the deck fallacy - informal
  • statement
  • stolen concept fallacy - informal
  • straw man fallacy - informal
  • subjective
  • suppressed evidence fallacy - informal
  • syllogism
  • symbolic logic
  • tautology
  • tautology fallacy - informal
  • teleological argument
  • theoretical definition
  • theoretical knowledge
  • transcendental argument
  • true
  • truth
  • truth-functional
  • truth-table
  • truth-value
  • tu quoque fallacy - informal
  • two wrongs make a right fallacy fallacy - informal
  • understanding
  • unsound
  • valid
  • value
  • variable
  • Venn diagrams
  • verbal dispute
  • virtue
  • weasel wording fallacy - informal
  • wisdom
  • wisdom of the ancients fallacy - informal