American English

Definition of inconceivable adjective from the Oxford Advanced American Dictionary

  

inconceivable

 adjective
adjective
NAmE//ˌɪnkənˈsivəbl//
 
 
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impossible to imagine or believe synonym unthinkable It is inconceivable that the manager was not aware of the problem. Then the inconceivable happened—I lost my job. opposite conceivable
 inconceivably
 
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NAmE//ˌɪnkənˈsivəbli//
 
adverb She was inconceivably wealthy.
See the Oxford Advanced Learner's Dictionary entry: inconceivable