FORMAL FAL By N., Sam M.S. - 0 a term used when involving a violation of a principle that is in formal logic. It is either affirming the consequent or denying the antecedent. It is a mistaken idea. FORMAL FAL: "A formal fallacy is a mistaken idea." Related Psychology Terms DENYING THE ANTECEDENT ANTECEDENT LEGAL PSYCHOLOGY (Forensic Psychology) Piaget’s Theory of Cognitive Development DENYING THE CONSEQUENT CONDITIONAL REASONING ARISTOTELIAN INHIBITION A Comparison of Maternal and Paternal Filicide TALION LAW Cite this page: N., Sam M.S., "FORMAL FAL," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/formal-fallacy/ (accessed June 28, 2022).