irrationality.

Thinking or behavior that does not follow coherent reasons or available evidence.

Use it for

Words that belong together

• apparent irrationality
• collective irrationality

On the page

The apparent irrationality diminished when the hidden incentive was revealed.

Usage notes

Primary category: analysis / argumentation / evidence. Forms: Usually uncountable; no ordinary plural in this sense. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Commonness: moderately common.