fallacy
//ˈfæl.ə.si//
Noun
fallacySingular
fallaciesPlural
1
A mistaken belief or false idea, especially one based on unsound reasoning.
It is a common fallacy that money can buy happiness.
2
A failure in reasoning that renders an argument invalid or logically flawed.
The professor pointed out the logical fallacy in the student's argument.
3
The quality or state of being deceptive or misleading.
The fallacy of his argument became clear when we examined the evidence.