Great folly; extreme senselessness
The quality or state of being absurd; nonsense
Extreme folly or stupidity.
The state or quality of being inconsistent.
(Countable) An act that is stupid.
Find another word for irrationality. In this page you can discover 25 synonyms, antonyms, idiomatic expressions, and related words for irrationality, like: unreasonableness, reason, subjectivism, insanity, absurdity, illogicality, invalidity, idiocy, inconsistency, nonsense and stupidity.