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Synonyms

fallacious

American  
[fuh-ley-shuhs] / fəˈleɪ ʃəs /

adjective

  1. containing a fallacy; logically unsound.

    fallacious arguments.

  2. deceptive; misleading.

    fallacious testimony.

  3. disappointing; delusive.

    a fallacious peace.
fallacious British  
/ fəˈleɪʃəs /

adjective

  1. containing or involving a fallacy; illogical; erroneous

  2. tending to mislead

  3. delusive or disappointing

    a fallacious hope
"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • fallaciously adverb
  • fallaciousness noun
  • nonfallacious adjective
  • nonfallaciously adverb
  • nonfallaciousness noun
  • unfallacious adjective
  • unfallaciously adverb

Etymology

Origin of fallacious

First recorded in 1500–10, fallacious is from the Latin word fallāciōsus deceitful, deceptive. See fallacy, -ous

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.