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[fuh-ley-shuh s] /fəˈleɪ ʃəs/

containing a ; logically unsound:
fallacious arguments.
deceptive; misleading:
fallacious testimony.
disappointing; delusive:
a fallacious peace.
containing or involving a fallacy; illogical; erroneous
tending to mislead
delusive or disappointing: a fallacious hope

c.1500, from fallacy (Latin fallacia) + -ous. Related: Fallaciously; fallaciousness.


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  • Fallacy-of-composition

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  • Fallacy-of-division

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  • Fallacy of many questions

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