Fallacious

//fəˈleɪ.ʃəs// adj

adj ·Common ·High school level

Definitions

Adjective
  1. 1
    Characterized by fallacy; false or mistaken.

    "There is a widely diffused notion that among all specimens of animal creation man alone possesses any glimmering of reason. This notion is largely fallacious. It is one of those ideas, based upon superficial knowledge, which appeal to the sophisticated modern public."

  2. 2
    Deceptive or misleading.
Adjective
  1. 1
    based on an incorrect or misleading notion or information wordnet
  2. 2
    involving deception wordnet
  3. 3
    containing or based on a fallacy wordnet

Synonyms

All synonyms
invalidaberrantabroadabsonantadriftairy

Example

More examples

"Her line of reasoning is attractive, but ultimately fallacious."

Etymology

From Middle English fallacious; equivalent to fallacy + -ous.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.