1. containing or based on a fallacy

fallacious reasoning


an unsound argument

Syn: ↑unsound
Similar to: ↑invalid
Derivationally related forms: ↑unsoundness (for: ↑unsound), ↑fallacy, ↑fallaciousness
2. intended to deceive

deceitful advertising


fallacious testimony


"smooth, shining, and deceitful as thin ice" - S.T.Coleridge


a fraudulent scheme to escape paying taxes

Syn: ↑deceitful, ↑fraudulent
Similar to: ↑dishonest, ↑dishonorable
Derivationally related forms: ↑fraudulence (for: ↑fraudulent), ↑deceitfulness (for: ↑deceitful)
3. based on an incorrect or misleading notion or information

fallacious hope

Similar to: ↑incorrect, ↑wrong
Derivationally related forms: ↑fallaciousness

Useful english dictionary. 2012.

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  • Fallacious — Fal*la cious, a. [L. fallaciosus, fr. fallacia: cf. F. fallacieux. See {Fallacy}.] Embodying or pertaining to a fallacy; illogical; fitted to deceive; misleading; delusive; as, fallacious arguments or reasoning. {Fal*la cious*ly}, adv. {Fal*la… …   The Collaborative International Dictionary of English

  • fallacious — [fə lā′shəs] adj. [L fallaciosus] 1. containing a fallacy; erroneous [fallacious reasoning] 2. a) misleading or deceptive b) causing disappointment; delusive fallaciously adv. fallaciousness n …   English World dictionary

  • fallacious — I adjective abounding in error, beguiling, contrary to fact, deceitful, deceiving, deceptive, delusive, delusory, devoid of truth, distorted, erroneous, fallax, false, faultful, faulty, faulty in logic, fraudulent, groundless, guileful, illusive …   Law dictionary

  • fallacious — c.1500, from FALLACY (Cf. fallacy) (L. fallacia) + OUS (Cf. ous). Related: Fallaciously; fallaciousness …   Etymology dictionary

  • fallacious — sophistical, casuistical (see under FALLACY) Analogous words: irrational, unreasonable: *misleading, deceptive, delusive, delusory: equivocal, ambiguous (see OBSCURE) Antonyms: sound, valid …   New Dictionary of Synonyms

  • fallacious — [adj] false, wrong beguiling, deceiving, deceptive, deluding, delusive, delusory, erroneous, fictitious, fishy*, fraudulent, illogical, illusory, incorrect, invalid, irrational, mad, misleading, mistaken, off*, phony, reasonless, sophistic,… …   New thesaurus

  • fallacious — fallaciously, adv. fallaciousness, n. /feuh lay sheuhs/, adj. 1. containing a fallacy; logically unsound: fallacious arguments. 2. deceptive; misleading: fallacious testimony. 3. disappointing; delusive: a fallacious peace. [1500 10; < L… …   Universalium

  • fallacious — [[t]fəle͟ɪʃəs[/t]] ADJ GRADED If an idea, argument, or reason is fallacious, it is wrong because it is based on a fallacy. [FORMAL] Their main argument is fallacious, and their conclusions untenable. Syn: false …   English dictionary

  • fallacious — /fəˈleɪʃəs/ (say fuh layshuhs) adjective 1. deceptive: fallacious evidence. 2. containing a fallacy; logically unsound: fallacious arguments. –fallaciously, adverb –fallaciousness, noun …  

  • fallacious — adjective Date: 1509 1. embodying a fallacy < a fallacious conclusion > 2. tending to deceive or mislead ; delusive • fallaciously adverb • fallaciousness noun …   New Collegiate Dictionary

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