A fallacious argument or illogical conclusion, especially one committed by mistake, or believed by the speaker to be logical
Which is a Paralogism not admittible; a fallacy that dwels not in a cloud, and needs not the Sun to scatter it.
A reasoning which is false in point of form, that is, which is contrary to logical rules or formulæ; a formal fallacy, or pseudo- syllogism, in which the conclusion does not follow from the premises