fallacious

fallacious (fəˈleɪʃəs)

—*adj*
1.	containing or involving a fallacy; illogical; erroneous
2.	tending to mislead
3.	delusive or disappointing: a fallacious hope

fal'laciously

—*adv*

fal'laciousness

—n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

fallacious

c.1500, from L. fallacia (see fallacy) + -ous.

Example sentences

The idea that gratification is a completion of the wish is fallacious.

It is fallacious to estimate the magnitude of a health problem due to micronutrient malnutrition using extant signs of deficiency.

None of those are necessary to recognising fallacious arguments and poor scientific practice.

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fallacy false illusory sophister sophistic sophistication

Matching Quote

"In it he proves that all things are true and states how the truths of all contradictions may be reconciled physically, such as for example that white is black and black is white; that one can be and not be at the same time; that there can be hills without valleys; that nothingness is something and that everything, which is, is not. But take note that he proves all these unheard-of paradoxes without any fallacious or sophistical reasoning."

-Savinien Cyrano De Bergerac