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.
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 deceive.” (Other descendants of fallere in English include fail, false, and fault.)
Recognizing fallacious arguments tends to strengthen one's confidence that the valid arguments are indeed valid.
Definition of fallacious adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
- Containing or based on a fallacy: a fallacious assumption. 2. Tending to mislead; deceptive: fallacious testimony.
Adjective fallacious (comparative more fallacious, superlative most fallacious) Characterized by fallacy; false or mistaken. Synonyms: erroneous, incorrect, wrong; see also Thesaurus: false Antonyms: accurate, correct, true Hyponyms: specious, spurious
There are five meanings listed in OED's entry for the adjective fallacious, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.
Waxing indignant by way of a period piece is fallacious in a number of ways. The second fallacious notion is that work is supposed to be fun. Manning turned slowly, a fallacious smile on his lips, his eyes hard. First, there are those words which spring from fallacious theories, such as the element of fire or the concept of a first mover.
Fallacious refers to something that is misleading or deceptive in nature, often relating to incorrect or faulty reasoning or arguments. It is derived from faulty logic or mistaken beliefs, and not designed to stand up to rigorous scrutiny.