Definition of irrational adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ɪˈræʃənl//
; NAmE NAmE//ɪˈræʃənl//
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not based on, or not using, clear logical thought synonym unreasonable an irrational fear You're being irrational. opposite rational Word Originlate Middle English: from Latin irrationalis, from in- ‘not’ + rationalis (from ratio(n-) ‘reckoning, reason’, from rat- ‘reckoned’, from the verb reri).Extra examples There was nothing inherently irrational in such a decision. These are just irrational fears. What is the reason for this seemingly irrational behaviour? You’re being irrational.
See the Oxford Advanced American Dictionary entry: irrational

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