It will come as no surprise that fallacious is related to the noun fallacy, meaning “delusion” or “falsehood.” Both words come from the Latin word fallacia, which in turn comes from fallere, meaning …

To unquestioningly adhere to traditional policies when there is good reason for change can be regarded as a fallacious appeal to authority.

3 days ago · fallacious (comparative more fallacious, superlative most fallacious) Characterized by fallacy; false or mistaken.

FALLACIOUS definition: containing a fallacy; logically unsound. See examples of fallacious used in a sentence.

fallacious, adj. meanings, etymology, pronunciation and more in the Oxford English Dictionary

If an idea, argument, or reason is fallacious, it is wrong because it is based on a fallacy.

Definition of fallacious adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Fallacious comes ultimately from the Latin fallax, "deceptive." The word fallacious might describe an intentional deception or a false conclusion coming from bad science or incomplete understanding.

Synonyms for FALLACIOUS: unreasonable, irrational, unreasoning, illegitimate, misleading, unreasoned, illogical, absurd; Antonyms of FALLACIOUS: reasonable, logical, valid, rational, sound, …

The most common fallacious argument is that current climate change must be natural because climate has changed naturally in the past.