A
fallacy is the use of invalid or otherwise faulty
reasoning, or "wrong moves" in the construction of an
argument. A fallacious argument may be deceptive by appearing to be better than it really is. Some fallacies are committed intentionally to
manipulate or
persuade by
deception, while others are committed unintentionally due to carelessness or ignorance, as even lawyers admit that the extent to which an argument is sound or unsound depends on the context in which the argument is made.