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English definition of “unaccountable”

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unaccountable

adjective [not gradable]  /ˌʌn·əˈkɑʊn·tə·bəl/ us  
not able to be explained or understood: For some unaccountable reason, he forgot his car keys. Someone who is unaccountable does not have to explain his or her actions to anyone in authority.
(Definition of unaccountable from the Cambridge Academic Content Dictionary © Cambridge University Press)
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