89 Synonyms & Antonyms of IRRATIONAL - Merriam-Webster
https://www.merriam-webster.com/thesaurus/irrationalSynonyms for IRRATIONAL: unreasonable, unreasoning, illogical, unreasoned, illegitimate, absurd, nonrational, foolish; Antonyms of IRRATIONAL: rational, reasonable, logical, valid, …
Irrationality - Wikipedia
https://en.wikipedia.org/wiki/IrrationalityIrrationality is cognition, thinking, talking, or acting without inclusion of rationality. It is more specifically described as an action or opinion given through inadequate use of reason, or through emotional distress or cognitive deficiency. The term is used, usually pejoratively, to describe thinking and actions that are, or appear to be, less useful, or more illogical than other more rational alternatives.