Adjective
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based on an incorrect or misleading notion or information
"fallacious hope"
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intended to deceive
"deceitful advertising"
"fallacious testimony"
"smooth, shining, and deceitful as thin ice" - S.T.Coleridge
"a fraudulent scheme to escape paying taxes"
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containing or based on a fallacy
"fallacious reasoning"
"an unsound argument"