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fallacious

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The definition of fallacious is something based on an erroneous or mistaken belief.

(adjective)

When you make an argument based on a mistaken belief, this is an example of an argument that would be described as fallacious.

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See fallacious in Webster's New World College Dictionary

adjective

containing a fallacy; erroneous: fallacious reasoning
1. misleading or deceptive
2. causing disappointment; delusive

Origin: L fallaciosus

Related Forms:

fallaciously adverb
fallaciousness noun

See fallacious in American Heritage Dictionary 4

adjective

Containing or based on a fallacy: a fallacious assumption.
Tending to mislead; deceptive: fallacious testimony.

Related Forms:

fal·laˈcious·ly adverb

fal·laˈcious·ness noun

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