Equivocation – the misleading use of a term with more than one meaning (by glossing over which meaning is intended at a particular time).[21]
Ambiguous middle term – a common ambiguity in syllogisms in which the middle term is equivocated.[22]
Definitional retreat – changing the meaning of a word to deal with an objection raised against the original wording.[1]
Motte-and-bailey fallacy – the arguer conflates two positions with similar properties, one modest and easy to defend (the "motte") and one much more controversial (the "bailey").[23] The arguer advances the controversial position, but when challenged, they insist that they are only advancing the more modest position.[24][25] This fallacy has been described as the inverse of the straw man, in "replacing a weak position with a strong position to better defend it" rather than "replacing a strong position with a weak position to better attack it".[26]
Fallacy of accent – a specific type of ambiguity that arises when the meaning of a sentence is changed by placing an unusual prosodic stress, or when, in a written passage, it is left unclear which word the emphasis was supposed to fall on.
Persuasive definition – a form of stipulative definition which purports to describe the "true" or "commonly accepted" meaning of a term, while in reality stipulating an uncommon or altered use.
(See also the if-by-whiskey fallacy, below)
Ecological fallacy – inferences about the nature of specific individuals are based solely upon aggregate statistics collected for the group to which those individuals belong.[27]
Etymological fallacy – reasoning that the original or historical meaning of a word or phrase is necessarily similar to its actual present-day usage.[28]
Fallacy of composition – assuming that something true of part of a whole must also be true of the whole.[29]
Fallacy of division – assuming that something true of a thing must also be true of all or some of its parts.[30]
False attribution – an advocate appeals to an irrelevant, unqualified, unidentified, biased or fabricated source in support of an argument.
Fallacy of quoting out of context (contextotomy, contextomy; quotation mining) – refers to the selective excerpting of words from their original context in a way that distorts the source's intended meaning.[31]
False authority (single authority) – using an expert of dubious credentials or using only one opinion to sell a product or idea. Related to the appeal to authority.
False dilemma (false dichotomy, fallacy of bifurcation, black-or-white fallacy) – two alternative statements are held to be the only possible options when in reality there are more.[32]
False equivalence – describing a situation of logical and apparent equivalence, when in fact there is none.
Feedback fallacy - in the context of performance appraisal, the belief in the accuracy of feedback, despite evidence that feedback is subject to large systematic errors due to the idiosyncratic rater effect.[33]
Historian's fallacy – the assumption that decision makers of the past viewed events from the same perspective and had the same information as those subsequently analyzing the decision.[34] (Not to be confused with presentism, which is a mode of historical analysis in which present-day ideas, such as moral standards, are projected into the past.)
Historical fallacy – a set of considerations is thought to hold good only because a completed process is read into the content of the process which conditions this completed result.[35]
Baconian fallacy - using pieces of historical evidence without the aid of specific methods, hypotheses, or theories in an attempt to make a general truth about the past. Commits historians "to the pursuit of an impossible object by an impracticable method".[36]
Homunculus fallacy – a "middle-man" is used for explanation; this sometimes leads to regressive middle-men. Explains without actually explaining the real nature of a function or a process. Instead, it explains the concept in terms of the concept itself, without first defining or explaining the original concept. Explaining thought as something produced by a little thinker, a sort of homunculus inside the head, merely explains it as another kind of thinking (as different but the same).[37]
Inflation of conflict – arguing that if experts of a field of knowledge disagree on a certain point, the experts must know nothing, and therefore no conclusion can be reached, or that the legitimacy of their entire field is put to question.[38]