fallacy

Inflections of 'fallacy' (n): npl: fallacies

fal•la•cy n., pl. -cies.

a deceptive, misleading, or false notion;
misconception:[countable]It's a fallacy to think that government will solve all our problems.
Philosophy faulty or erroneous reasoning:[uncountable]The statement was based on fallacy.
a misleading or unsound argument:[countable]A good logician would see the fallacies in your reasoning.

fal•la•cy n., pl. -cies.

a deceptive, misleading, or false notion, belief, etc.:That the world is flat was at one time a popular fallacy.
a misleading or unsound argument.
deceptive, misleading, or false nature;
erroneousness.
Philosophy[Logic.]any of various types of erroneous reasoning that render arguments logically unsound.
[Obs.]deception.

Middle French
Latin fallācia a trick, deceit, equivalent. to fallāc- (stem of fallāx) deceitful, fallacious + -ia -y³; replacing Middle English fallace
1350–1400

Collins Concise English Dictionary © HarperCollins Publishers::

fallacy /ˈfæləsɪ/ n ( pl -cies)

an incorrect or misleading notion or opinion based on inaccurate facts or invalid reasoning
unsound or invalid reasoning
the tendency to mislead
an error in reasoning that renders an argument logically invalid

Etymology: 15th Century: from Latin fallācia, from fallax deceitful, from fallere to deceive

'fallacy' also found in these entries (note: many are not synonyms or translations):

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