Fal*la"cious (?), a. [L. fallaciosus, fr. fallacia: cf. F. fallacieux. See Fallacy.]
Embodying or pertaining to a fallacy; illogical; fitted to deceive; misleading; delusive; as, fallacious arguments or reasoning.
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Fal*la"cious*ly, adv. -
Fal*la"cious*ness, n.
© Webster 1913.