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Definition of irrational adjective from the Oxford Advanced American Dictionary

 

irrational

 adjective
adjective
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
irrationality
 
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NAmE//ɪˌræʃəˈnælət̮i//
 
noun [uncountable, countable, usually singular]
irrationally
 
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NAmE//ɪˈræʃənəli//
 
adverb to behave irrationallySee irrational in the Oxford Advanced Learner's Dictionary
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