irrationality
nounUK /ɪˌræʃəˈnæləti/
US /ɪˌræʃəˈnæləti/
The quality of not thinking clearly or making sense.
His irrationality made him afraid of a harmless little spider.
RELATED WORDS
OTHER MEANINGS
2. A belief or action that does not follow reason.
Buying a boat he could never use was just one of his irrationalities.
3. In math, a number that cannot be written as a simple fraction.
The irrationality of pi means its decimal never ends or repeats.
4. A lack of clear thinking caused by strong feelings.
Fear can lead to irrationality, like running from a tiny mouse.