Meaning of “irrational” in the English Dictionary

"irrational" in British English

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irrationaladjective

uk /ɪˈræʃ.ən.əl/ us /ɪˈræʃ.ən.əl/
irrationally
adverb uk /ɪˈræʃ.ən.əl.i/ us /ɪˈræʃ.ən.əl.i/

People often behave irrationally when they are under stress.
irrationality
noun [ U ] uk /ɪˌræʃ.ənˈæl.ə.ti/ us /ɪˌræʃ.ənˈæl.ə.t̬i/

(Definition of “irrational” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"irrational" in American English

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irrationaladjective

us /ɪˈræʃ·ə·nəl/

not based on reason or clear thinking; not reasonable:

One of her main themes is the irrational nature of love.

(Definition of “irrational” from the Cambridge Academic Content Dictionary © Cambridge University Press)