fallacious

fallacious
adjective
fal·;la·;cious f;-;l;-sh;s
Synonyms of fallacious
1
: embodying a fallacy
a fallacious conclusion
a fallacious argument
2
: tending to deceive or mislead : delusive
false and fallacious hopes
—Conyers Middleton
fallaciously adverb
fallaciousness noun


Did you know?
Oh what a tangled web we weave / When first we practise to deceive! So wrote Sir Walter Scott in his 1808 poem Marmion. Scott’s line wasn't written with etymology in mind, but it might be applied to the history of "fallacious." That word traces back to the Latin verb fallere ("to deceive"), but it passed through a tangle of Latin and French forms before it eventually made its way into English in the early 1500s. Other descendants of "fallere" in English include "fail," "false," and "fault."

Synonyms
illegitimate
illogical
inconsequent
inconsequential
invalid
irrational
nonrational
unreasonable
unreasoning
unsound
weak
Examples of fallacious in a Sentence
it's fallacious to say that something must exist because science hasn't proven its nonexistence
consumers who harbor the fallacious belief that credit-card spending will never catch up with them
Recent Examples on the Web
But hard evidence in both our nation’s history and our present shows that this reasoning is fallacious.
—Ana Raquel Minian, TIME, 30 May 2024
And why not seek the truth, to give order and organization to a chaotic and fallacious narrative and investigative material?
—Boris Sollazzo, The Hollywood Reporter, 28 Feb. 2024
This is such a fallacious argument and its presentation as acceptable is abhorrent to our standards of morality.
—Letters To The Editor, The Mercury News, 24 Jan. 2024
Catherine Weller, director of global policy for Fauna & Flora International, tells Popular Mechanics that Barron’s argument is fallacious.
—Susan Lahey, Popular Mechanics, 24 July 2023