logical fallacy

noun

A fallacy; a clearly defined error in reasoning used to support or refute an argument, excluding simple unintended mistakes.

“A valid syllogism contains three terms; with four it commits the logical fallacy known as quaternio terminorum.”

Meanings

nounlogical fallacy (plural logical fallacies)

plural logical fallacies · alternative logic fallacy

  1. A fallacy; a clearly defined error in reasoning used to support or refute an argument, excluding simple unintended mistakes.

    Synonyms: fallacy, incorrect argument, misargument, non-argument, pseudoargument

  2. A formal fallacy.

    A valid syllogism contains three terms; with four it commits the logical fallacy known as quaternio terminorum.

Synonyms & antonyms

nounA fallacy; a clearly defined error in reasoning used to support or refute an argument, excluding simple unintended mistakes.

Also see

Translations

Chinese Mandarin 邏輯謬誤 /逻辑谬误
  • 邏輯謬誤 /逻辑谬误 (luójí miùwù)clearly defined error in reasoning
Czech logický klam
  • logický klamclearly defined error in reasoning
Italian errore logico, falso ragionamento
  • errore logicoclearly defined error in reasoning
  • falso ragionamentoclearly defined error in reasoning
  • sofismaclearly defined error in reasoning
Polish błąd logiczny
  • błąd logicznyclearly defined error in reasoning
Tagalog kamalian
  • kamalianclearly defined error in reasoning
Cite this entry
APA

logical fallacy. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/logical%20fallacy

MLA

“logical fallacy.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/logical%20fallacy. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “logical fallacy,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/logical%20fallacy.

Source: logical fallacy on Wiktionary, CC BY-SA 4.0.