Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “irrational”

See all translations

irrational

adjective
 
 
/ɪˈræʃənəl/
Irrational feelings and actions are based on your emotions and not on good reasons: irrational behaviour an irrational fear of flyingOf unsound mindStupid and silly
irrationality
 
 
/ɪˌræʃənˈæləti/ noun [U]
irrationally adverb
Translations of “irrational”
in Spanish irracional, absurd…
in Chinese (Traditional) 不理智的,沒有理性的…
in Russian нерациональный…
in Turkish mantıksız, saçma, akla dayanmayan…
in Chinese (Simplified) 不理智的,没有理性的…
in Polish irracjonalny…
(Definition of irrational from the Cambridge Learners Dictionary © Cambridge University Press)
Add Cambridge dictionaries to your browser to your website

Definitions of “irrational” in other dictionaries

Word of the Day

hyphen

the symbol -, used to join two words together, or to show that a word has been divided into two parts at the end of one line and the beginning of the next

Word of the Day

Lies, lies, lies!

by Kate Woodford,
February 25, 2015
​​​ According to sociologists (=people who study the relationships between people living in groups), we are good at lying. As a species, we have developed a remarkable ability to deceive each other (= persuade each other that something false is true). Being able to say things that are not true can help with

Read More 

snapchat verb

March 02, 2015
to send someone a message using the photomessaging application Snapchat We used to have a thing until he got a girlfriend. now

Read More