Definition of irrational adjective from the Oxford Advanced American Dictionary

     

    irrational

     adjective
    adjective
    NAmE//ɪˈræʃənl//
     
     
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  1. 1not based on, or not using, clear logical thought synonym unreasonable
  2. 2 an irrational fear You're being irrational. opposite rational
irrationality
 
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NAmE//ɪˌræʃəˈnælət̮i//
 
noun [uncountable, countable, usually singular]
irrationally
 
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NAmE//ɪˈræʃənəli//
 
adverb to behave irrationally
See the Oxford Advanced Learner's Dictionary entry: irrational

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