nonlogical

Nonlogical is an adjective used to describe things that are not governed by or derived from logic. In philosophy and cognitive science, it contrasts with logical or formal reasoning, which adheres to rules of deduction, validity, and evidence. Nonlogical content or processes include intuitive, emotional, or experiential factors that influence thought without following formal logical structure.

In arguments, nonlogical elements may shape conclusions through appeals to emotion, authority, tradition, or habit rather than demonstrable evidence. In everyday discourse, people speak of nonlogical beliefs, such as superstitions or habits of mind that persist despite lacking logical justification. In psychology, researchers study nonlogical reasoning—heuristics, biases, and affective judgments—that operate outside explicit logical rules. In critical thinking, distinguishing nonlogical from logical elements helps assess the reliability of conclusions. Because the term is broad and its precise meaning varies by discipline, nonlogical is not a technical synonym for “illogical” or “irrational,” though it is often used in contrast to logical reasoning.