Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “illogical”


adjective     /ɪˈlɒdʒ.ɪ.kəl/ US  /-ˈlɑː.dʒɪ-/
not reasonable , wise , or practical , usually because directed by the emotions rather than by careful thought : It is an illogical statement , because if one part is true , then the other must be false .Stupid and sillyOf unsound mindLogic and reason illogically     /-i/ adverb Stupid and sillyOf unsound mindLogic and reason illogicality     /ɪˌlɒdʒ.ɪˈkæl.ɪ.ti/ US  /ɪˌlɑː.dʒɪˈkæl.ə.t̬i/ noun [U] Logic and reason
(Definition of illogical adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of illogical

Browse related topics

You are looking at an entry to do with Logic and reason, but you might be interested in these topics from the Thinking, dreaming and ideas topic area:

Definitions of “illogical” in other dictionaries

Word of the Day


a situation in which two people are friends

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More