illogico

Illogico is an Italian adjective meaning not logical or lacking in logical coherence. It is used to describe statements, arguments, or conclusions that do not meet the standards of validity or soundness required by formal logic, as well as thinking or behavior that seems irrational or inconsistent.

The word derives from Latin illogicus, from in- “not” + logicus “related to logic,” and is cognate with English illogical, French illogique, and Spanish ilógico in its respective forms.

In philosophy and rhetoric, illogico is applied to arguments with fallacies, non sequiturs, or contradicting premises. In everyday language, it can signal perceived irrationality or inconsistency in a person’s reasoning or a story’s plot. In Italian discourse, illogico may be used descriptively about ideas that fail to establish a coherent framework, or figuratively to describe events that defy common sense.

Although related terms exist—logico, logic, logica—illogico is not a formal label of a specific logical theory or fallacy; rather, it is a qualitative assessment. The adverbial form illogicamente is used to modify verbs, conveying “illogically.”